281431013 has 4 divisors (see below), whose sum is σ = 293667168. Its totient is φ = 269194860.

The previous prime is 281431009. The next prime is 281431027. The reversal of 281431013 is 310134182.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 310134182 = 2 ⋅155067091.

It is a cyclic number.

It is not a de Polignac number, because 281431013 - 2² = 281431009 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (23), and also a Moran number because the ratio is a prime number: 12236131 = 281431013 / (2 + 8 + 1 + 4 + 3 + 1 + 0 + 1 + 3).

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 281431013.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (281431043) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6118043 + ... + 6118088.

It is an arithmetic number, because the mean of its divisors is an integer number (73416792).

Almost surely, 2^281431013 is an apocalyptic number.

281431013 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

It is an amenable number.

281431013 is a deficient number, since it is larger than the sum of its proper divisors (12236155).

281431013 is a wasteful number, since it uses less digits than its factorization.

281431013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12236154.

The product of its (nonzero) digits is 576, while the sum is 23.

The square root of 281431013 is about 16775.9057281567. The cubic root of 281431013 is about 655.3258778933.

Adding to 281431013 its reverse (310134182), we get a palindrome (591565195).

The spelling of 281431013 in words is "two hundred eighty-one million, four hundred thirty-one thousand, thirteen".