55415905 has 8 divisors (see below), whose sum is σ = 66561192. Its totient is φ = 44291328.

The previous prime is 55415881. The next prime is 55415909. The reversal of 55415905 is 50951455.

It can be written as a sum of positive squares in 4 ways, for example, as 5161984 + 50253921 = 2272^2 + 7089^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 55415905 - 2⁵ = 55415873 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (55415909) 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, 1497 + ... + 10633.

It is an arithmetic number, because the mean of its divisors is an integer number (8320149).

Almost surely, 2^55415905 is an apocalyptic number.

It is an amenable number.

55415905 is a deficient number, since it is larger than the sum of its proper divisors (11145287).

55415905 is a wasteful number, since it uses less digits than its factorization.

55415905 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10355.

The product of its (nonzero) digits is 22500, while the sum is 34.

The square root of 55415905 is about 7444.1859863923. The cubic root of 55415905 is about 381.2514259554.

The spelling of 55415905 in words is "fifty-five million, four hundred fifteen thousand, nine hundred five".