87523591 has 2 divisors, whose sum is σ = 87523592. Its totient is φ = 87523590.

The previous prime is 87523577. The next prime is 87523603. The reversal of 87523591 is 19532578.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 87523591 - 2⁵ = 87523559 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (87523091) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43761795 + 43761796.

It is an arithmetic number, because the mean of its divisors is an integer number (43761796).

Almost surely, 2^87523591 is an apocalyptic number.

87523591 is a deficient number, since it is larger than the sum of its proper divisors (1).

87523591 is an equidigital number, since it uses as much as digits as its factorization.

87523591 is an evil number, because the sum of its binary digits is even.

The product of its digits is 75600, while the sum is 40.

The square root of 87523591 is about 9355.4043739434. The cubic root of 87523591 is about 443.9918954639.

The spelling of 87523591 in words is "eighty-seven million, five hundred twenty-three thousand, five hundred ninety-one".