55797281 has 16 divisors (see below), whose sum is σ = 62544960. Its totient is φ = 49466880.

The previous prime is 55797271. The next prime is 55797299. The reversal of 55797281 is 18279755.

It is a de Polignac number, because none of the positive numbers 2^k-55797281 is a prime.

It is a super-2 number, since 2×55797281² = 6226673133985922, which contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (55797211) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 72941 + ... + 73701.

It is an arithmetic number, because the mean of its divisors is an integer number (3909060).

Almost surely, 2^55797281 is an apocalyptic number.

55797281 is the 4313-rd octagonal number.

It is an amenable number.

55797281 is a deficient number, since it is larger than the sum of its proper divisors (6747679).

55797281 is a wasteful number, since it uses less digits than its factorization.

55797281 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1024.

The product of its digits is 176400, while the sum is 44.

The square root of 55797281 is about 7469.7577604632. The cubic root of 55797281 is about 382.1240265929.

The spelling of 55797281 in words is "fifty-five million, seven hundred ninety-seven thousand, two hundred eighty-one".