87513381522 has 90 divisors (see below), whose sum is σ = 221356775367. Its totient is φ = 24986252088.

The previous prime is 87513381521. The next prime is 87513381523. The reversal of 87513381522 is 22518331578.

87513381522 is a `hidden beast` number, since 8 + 7 + 513 + 3 + 81 + 52 + 2 = 666.

It is an interprime number because it is at equal distance from previous prime (87513381521) and next prime (87513381523).

It can be written as a sum of positive squares in only one way, i.e., 43756690761 + 43756690761 = 209181^2 + 209181^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=209181.

It is not an unprimeable number, because it can be changed into a prime (87513381521) by changing a digit.

It is a polite number, since it can be written in 44 ways as a sum of consecutive naturals, for example, 61498503 + ... + 61499925.

Almost surely, 2^87513381522 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 87513381522

87513381522 is an abundant number, since it is smaller than the sum of its proper divisors (133843393845).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

87513381522 is an frugal number, since it uses more digits than its factorization.

87513381522 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2882 (or 1435 counting only the distinct ones).

The product of its digits is 403200, while the sum is 45.

The spelling of 87513381522 in words is "eighty-seven billion, five hundred thirteen million, three hundred eighty-one thousand, five hundred twenty-two".