15550897 has 2 divisors, whose sum is σ = 15550898. Its totient is φ = 15550896.

The previous prime is 15550877. The next prime is 15550919. The reversal of 15550897 is 79805551.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 11771761 + 3779136 = 3431^2 + 1944^2 .

It is a cyclic number.

It is not a de Polignac number, because 15550897 - 2²³ = 7162289 is a prime.

It is not a weakly prime, because it can be changed into another prime (15550817) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7775448 + 7775449.

It is an arithmetic number, because the mean of its divisors is an integer number (7775449).

Almost surely, 2^15550897 is an apocalyptic number.

It is an amenable number.

15550897 is a deficient number, since it is larger than the sum of its proper divisors (1).

15550897 is an equidigital number, since it uses as much as digits as its factorization.

15550897 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 63000, while the sum is 40.

The square root of 15550897 is about 3943.4625648027. The cubic root of 15550897 is about 249.6041575659.

The spelling of 15550897 in words is "fifteen million, five hundred fifty thousand, eight hundred ninety-seven".