87522591 has 16 divisors (see below), whose sum is σ = 125856864. Its totient is φ = 53781504.

The previous prime is 87522571. The next prime is 87522593. The reversal of 87522591 is 19522578.

It is not a de Polignac number, because 87522591 - 2⁹ = 87522079 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (87522593) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 36955 + ... + 39251.

It is an arithmetic number, because the mean of its divisors is an integer number (7866054).

Almost surely, 2^87522591 is an apocalyptic number.

87522591 is a deficient number, since it is larger than the sum of its proper divisors (38334273).

87522591 is a wasteful number, since it uses less digits than its factorization.

87522591 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3290.

The product of its digits is 50400, while the sum is 39.

The square root of 87522591 is about 9355.3509287466. The cubic root of 87522591 is about 443.9902045157.

The spelling of 87522591 in words is "eighty-seven million, five hundred twenty-two thousand, five hundred ninety-one".