55903981 has 8 divisors (see below), whose sum is σ = 64226304. Its totient is φ = 47665680.

The previous prime is 55903957. The next prime is 55903997. The reversal of 55903981 is 18930955.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 55903981 - 2⁷ = 55903853 is a prime.

It is a super-2 number, since 2×55903981² = 6250510183296722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55903381) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 19570 + ... + 22243.

It is an arithmetic number, because the mean of its divisors is an integer number (8028288).

Almost surely, 2^55903981 is an apocalyptic number.

It is an amenable number.

55903981 is a deficient number, since it is larger than the sum of its proper divisors (8322323).

55903981 is a wasteful number, since it uses less digits than its factorization.

55903981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42011.

The product of its (nonzero) digits is 48600, while the sum is 40.

The square root of 55903981 is about 7476.8964818299. The cubic root of 55903981 is about 382.3674474844.

The spelling of 55903981 in words is "fifty-five million, nine hundred three thousand, nine hundred eighty-one".