55001905 has 32 divisors (see below), whose sum is σ = 78594048. Its totient is φ = 36158400.

The previous prime is 55001887. The next prime is 55001909. The reversal of 55001905 is 50910055.

It is not a de Polignac number, because 55001905 - 2¹⁵ = 54969137 is a prime.

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 55001905.

It is not an unprimeable number, because it can be changed into a prime (55001909) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 176700 + ... + 177010.

It is an arithmetic number, because the mean of its divisors is an integer number (2456064).

Almost surely, 2^55001905 is an apocalyptic number.

It is an amenable number.

55001905 is a deficient number, since it is larger than the sum of its proper divisors (23592143).

55001905 is a wasteful number, since it uses less digits than its factorization.

55001905 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 517.

The product of its (nonzero) digits is 1125, while the sum is 25.

The square root of 55001905 is about 7416.3269210574. The cubic root of 55001905 is about 380.2996367069.

The spelling of 55001905 in words is "fifty-five million, one thousand, nine hundred five".