281161051 has 4 divisors (see below), whose sum is σ = 281725000. Its totient is φ = 280597104.

The previous prime is 281161043. The next prime is 281161081. The reversal of 281161051 is 150161182.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 150161182 = 2 ⋅75080591.

It is a cyclic number.

It is not a de Polignac number, because 281161051 - 2³ = 281161043 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (281161081) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 281226 + ... + 282223.

It is an arithmetic number, because the mean of its divisors is an integer number (70431250).

Almost surely, 2^281161051 is an apocalyptic number.

281161051 is a deficient number, since it is larger than the sum of its proper divisors (563949).

281161051 is an equidigital number, since it uses as much as digits as its factorization.

281161051 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 563948.

The product of its (nonzero) digits is 480, while the sum is 25.

The square root of 281161051 is about 16767.8576747299. The cubic root of 281161051 is about 655.1162709506.

The spelling of 281161051 in words is "two hundred eighty-one million, one hundred sixty-one thousand, fifty-one".