15728571491 has 2 divisors, whose sum is σ = 15728571492. Its totient is φ = 15728571490.

The previous prime is 15728571449. The next prime is 15728571497. The reversal of 15728571491 is 19417582751.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 15728571491 - 2⁶ = 15728571427 is a prime.

It is a super-2 number, since 2×15728571491² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (15728571497) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7864285745 + 7864285746.

It is an arithmetic number, because the mean of its divisors is an integer number (7864285746).

Almost surely, 2^15728571491 is an apocalyptic number.

15728571491 is a deficient number, since it is larger than the sum of its proper divisors (1).

15728571491 is an equidigital number, since it uses as much as digits as its factorization.

15728571491 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 705600, while the sum is 50.

The spelling of 15728571491 in words is "fifteen billion, seven hundred twenty-eight million, five hundred seventy-one thousand, four hundred ninety-one".