55490913 has 10 divisors (see below), whose sum is σ = 82893954. Its totient is φ = 36993888.

The previous prime is 55490867. The next prime is 55490933. The reversal of 55490913 is 31909455.

55490913 is a `hidden beast` number, since 554 + 90 + 9 + 13 = 666.

It can be written as a sum of positive squares in only one way, i.e., 54863649 + 627264 = 7407^2 + 792^2 .

It is not a de Polignac number, because 55490913 - 2⁹ = 55490401 is a prime.

It is not an unprimeable number, because it can be changed into a prime (55490933) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 342456 + ... + 342617.

Almost surely, 2^55490913 is an apocalyptic number.

It is an amenable number.

55490913 is a deficient number, since it is larger than the sum of its proper divisors (27403041).

55490913 is an equidigital number, since it uses as much as digits as its factorization.

55490913 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 685085 (or 685076 counting only the distinct ones).

The product of its (nonzero) digits is 24300, while the sum is 36.

The square root of 55490913 is about 7449.2223084024. Note that the first 3 decimals coincide. The cubic root of 55490913 is about 381.4233622388.

The spelling of 55490913 in words is "fifty-five million, four hundred ninety thousand, nine hundred thirteen".