55091906 has 16 divisors (see below), whose sum is σ = 88416960. Its totient is φ = 25667280.

The previous prime is 55091903. The next prime is 55091921. The reversal of 55091906 is 60919055.

It is not an unprimeable number, because it can be changed into a prime (55091903) 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, 9566 + ... + 14201.

It is an arithmetic number, because the mean of its divisors is an integer number (5526060).

Almost surely, 2^55091906 is an apocalyptic number.

55091906 is a deficient number, since it is larger than the sum of its proper divisors (33325054).

55091906 is a wasteful number, since it uses less digits than its factorization.

55091906 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23849.

The product of its (nonzero) digits is 12150, while the sum is 35.

The square root of 55091906 is about 7422.3922019791. The cubic root of 55091906 is about 380.5069549536.

The spelling of 55091906 in words is "fifty-five million, ninety-one thousand, nine hundred six".