79521587 has 2 divisors, whose sum is σ = 79521588. Its totient is φ = 79521586.

The previous prime is 79521551. The next prime is 79521641. The reversal of 79521587 is 78512597.

It is a weak prime.

It is an emirp because it is prime and its reverse (78512597) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 79521587 - 2⁶ = 79521523 is a prime.

It is not a weakly prime, because it can be changed into another prime (79521527) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39760793 + 39760794.

It is an arithmetic number, because the mean of its divisors is an integer number (39760794).

Almost surely, 2^79521587 is an apocalyptic number.

79521587 is a deficient number, since it is larger than the sum of its proper divisors (1).

79521587 is an equidigital number, since it uses as much as digits as its factorization.

79521587 is an evil number, because the sum of its binary digits is even.

The product of its digits is 176400, while the sum is 44.

The square root of 79521587 is about 8917.4877067479. The cubic root of 79521587 is about 430.0262954895.

It can be divided in two parts, 79521 and 587, that added together give a palindrome (80108).

The spelling of 79521587 in words is "seventy-nine million, five hundred twenty-one thousand, five hundred eighty-seven".