55903581 has 16 divisors (see below), whose sum is σ = 82939200. Its totient is φ = 37215504.

The previous prime is 55903553. The next prime is 55903591. The reversal of 55903581 is 18530955.

It is a happy number.

55903581 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 55903581 - 2¹¹ = 55901533 is a prime.

It is a super-2 number, since 2×55903581² = 6250420737247122, which contains 22 as substring.

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55903591) 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 15 ways as a sum of consecutive naturals, for example, 29010 + ... + 30876.

It is an arithmetic number, because the mean of its divisors is an integer number (5183700).

Almost surely, 2^55903581 is an apocalyptic number.

It is an amenable number.

55903581 is a deficient number, since it is larger than the sum of its proper divisors (27035619).

55903581 is a wasteful number, since it uses less digits than its factorization.

55903581 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2985 (or 2979 counting only the distinct ones).

The product of its (nonzero) digits is 27000, while the sum is 36.

The square root of 55903581 is about 7476.8697327157. The cubic root of 55903581 is about 382.3665355199.

The spelling of 55903581 in words is "fifty-five million, nine hundred three thousand, five hundred eighty-one".