55974981 has 4 divisors (see below), whose sum is σ = 74633312. Its totient is φ = 37316652.

The previous prime is 55974973. The next prime is 55974983. The reversal of 55974981 is 18947955.

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.

It is not a de Polignac number, because 55974981 - 2³ = 55974973 is a prime.

It is a super-2 number, since 2×55974981² = 6266396995900722, 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 55974981.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55974983) 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, 9329161 + ... + 9329166.

It is an arithmetic number, because the mean of its divisors is an integer number (18658328).

Almost surely, 2^55974981 is an apocalyptic number.

It is an amenable number.

55974981 is a deficient number, since it is larger than the sum of its proper divisors (18658331).

55974981 is a wasteful number, since it uses less digits than its factorization.

55974981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18658330.

The product of its digits is 453600, while the sum is 48.

The square root of 55974981 is about 7481.6429345432. The cubic root of 55974981 is about 382.5292523230.

The spelling of 55974981 in words is "fifty-five million, nine hundred seventy-four thousand, nine hundred eighty-one".