55391017 has 12 divisors (see below), whose sum is σ = 62852608. Its totient is φ = 48727800.

The previous prime is 55390999. The next prime is 55391033. The reversal of 55391017 is 71019355.

55391017 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 55391017 - 2⁷ = 55390889 is a prime.

It is a hoax number, since the sum of its digits (31) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (31).

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 55391017.

It is not an unprimeable number, because it can be changed into a prime (55391047) 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 11 ways as a sum of consecutive naturals, for example, 3633 + ... + 11134.

Almost surely, 2^55391017 is an apocalyptic number.

It is an amenable number.

55391017 is a deficient number, since it is larger than the sum of its proper divisors (7461591).

55391017 is a wasteful number, since it uses less digits than its factorization.

55391017 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14820 (or 14809 counting only the distinct ones).

The product of its (nonzero) digits is 4725, while the sum is 31.

The square root of 55391017 is about 7442.5141585354. The cubic root of 55391017 is about 381.1943424260.

It can be divided in two parts, 5539 and 1017, that added together give a palindrome (6556).

The spelling of 55391017 in words is "fifty-five million, three hundred ninety-one thousand, seventeen".