55231905 has 16 divisors (see below), whose sum is σ = 88824384. Its totient is φ = 29305920.

The previous prime is 55231889. The next prime is 55231927. The reversal of 55231905 is 50913255.

It is not a de Polignac number, because 55231905 - 2⁴ = 55231889 is a prime.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6391 + ... + 12300.

It is an arithmetic number, because the mean of its divisors is an integer number (5551524).

Almost surely, 2^55231905 is an apocalyptic number.

It is an amenable number.

55231905 is a deficient number, since it is larger than the sum of its proper divisors (33592479).

55231905 is a wasteful number, since it uses less digits than its factorization.

55231905 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18896.

The product of its (nonzero) digits is 6750, while the sum is 30.

The square root of 55231905 is about 7431.8170725604. The cubic root of 55231905 is about 380.8289958067.

The spelling of 55231905 in words is "fifty-five million, two hundred thirty-one thousand, nine hundred five".