55392981 has 12 divisors (see below), whose sum is σ = 85915872. Its totient is φ = 31653048.

The previous prime is 55392979. The next prime is 55393031. The reversal of 55392981 is 18929355.

It is not a de Polignac number, because 55392981 - 2¹ = 55392979 is a prime.

It is a super-2 number, since 2×55392981² = 6136764688132722, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55392971) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 188265 + ... + 188558.

It is an arithmetic number, because the mean of its divisors is an integer number (7159656).

Almost surely, 2^55392981 is an apocalyptic number.

It is an amenable number.

55392981 is a deficient number, since it is larger than the sum of its proper divisors (30522891).

55392981 is a wasteful number, since it uses less digits than its factorization.

55392981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 376840 (or 376833 counting only the distinct ones).

The product of its digits is 97200, while the sum is 42.

The square root of 55392981 is about 7442.6461020258. The cubic root of 55392981 is about 381.1988477104.

The spelling of 55392981 in words is "fifty-five million, three hundred ninety-two thousand, nine hundred eighty-one".