281313631 has 4 divisors (see below), whose sum is σ = 283894600. Its totient is φ = 278732664.

The previous prime is 281313619. The next prime is 281313649. The reversal of 281313631 is 136313182.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 281313631 - 2⁹ = 281313119 is a prime.

It is a super-2 number, since 2×281313631² = 158274717972808322, which contains 22 as substring.

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 281313631.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (281313691) 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, 1290321 + ... + 1290538.

It is an arithmetic number, because the mean of its divisors is an integer number (70973650).

Almost surely, 2^281313631 is an apocalyptic number.

281313631 is a deficient number, since it is larger than the sum of its proper divisors (2580969).

281313631 is a wasteful number, since it uses less digits than its factorization.

281313631 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2580968.

The product of its digits is 2592, while the sum is 28.

The square root of 281313631 is about 16772.4068338447. The cubic root of 281313631 is about 655.2347553140.

The spelling of 281313631 in words is "two hundred eighty-one million, three hundred thirteen thousand, six hundred thirty-one".