15591157 has 2 divisors, whose sum is σ = 15591158. Its totient is φ = 15591156.

The previous prime is 15591151. The next prime is 15591161. The reversal of 15591157 is 75119551.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 12680721 + 2910436 = 3561^2 + 1706^2 .

It is a cyclic number.

It is not a de Polignac number, because 15591157 - 2¹⁹ = 15066869 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (15591151) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7795578 + 7795579.

It is an arithmetic number, because the mean of its divisors is an integer number (7795579).

Almost surely, 2^15591157 is an apocalyptic number.

It is an amenable number.

15591157 is a deficient number, since it is larger than the sum of its proper divisors (1).

15591157 is an equidigital number, since it uses as much as digits as its factorization.

15591157 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 7875, while the sum is 34.

The square root of 15591157 is about 3948.5639161599. The cubic root of 15591157 is about 249.8193735277.

The spelling of 15591157 in words is "fifteen million, five hundred ninety-one thousand, one hundred fifty-seven".