55903991 has 16 divisors (see below), whose sum is σ = 65940000. Its totient is φ = 46725120.

The previous prime is 55903957. The next prime is 55903997. The reversal of 55903991 is 19930955.

It is not a de Polignac number, because 55903991 - 2⁶ = 55903927 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55903997) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 44135 + ... + 45383.

It is an arithmetic number, because the mean of its divisors is an integer number (4121250).

Almost surely, 2^55903991 is an apocalyptic number.

55903991 is a deficient number, since it is larger than the sum of its proper divisors (10036009).

55903991 is a wasteful number, since it uses less digits than its factorization.

55903991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1586.

The product of its (nonzero) digits is 54675, while the sum is 41.

The square root of 55903991 is about 7476.8971505565. The cubic root of 55903991 is about 382.3674702835.

The spelling of 55903991 in words is "fifty-five million, nine hundred three thousand, nine hundred ninety-one".