55456381 has 24 divisors (see below), whose sum is σ = 62210304. Its totient is φ = 49304640.

The previous prime is 55456343. The next prime is 55456393. The reversal of 55456381 is 18365455.

It is a de Polignac number, because none of the positive numbers 2^k-55456381 is a prime.

It is a super-2 number, since 2×55456381² = 6150820387234322, which contains 22 as substring.

It is a Duffinian number.

Its product of digits (72000) is a multiple of the sum of its prime divisors (160).

It is a self number, because there is not a number n which added to its sum of digits gives 55456381.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55456301) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 909091 + ... + 909151.

It is an arithmetic number, because the mean of its divisors is an integer number (2592096).

Almost surely, 2^55456381 is an apocalyptic number.

It is an amenable number.

55456381 is a deficient number, since it is larger than the sum of its proper divisors (6753923).

55456381 is a wasteful number, since it uses less digits than its factorization.

55456381 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 189 (or 160 counting only the distinct ones).

The product of its digits is 72000, while the sum is 37.

The square root of 55456381 is about 7446.9041218482. The cubic root of 55456381 is about 381.3442258905.

The spelling of 55456381 in words is "fifty-five million, four hundred fifty-six thousand, three hundred eighty-one".