87957521 has 2 divisors, whose sum is σ = 87957522. Its totient is φ = 87957520.

The previous prime is 87957491. The next prime is 87957553. The reversal of 87957521 is 12575978.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 47761921 + 40195600 = 6911^2 + 6340^2 .

It is a cyclic number.

It is not a de Polignac number, because 87957521 - 2²⁶ = 20848657 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (87957421) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43978760 + 43978761.

It is an arithmetic number, because the mean of its divisors is an integer number (43978761).

Almost surely, 2^87957521 is an apocalyptic number.

It is an amenable number.

87957521 is a deficient number, since it is larger than the sum of its proper divisors (1).

87957521 is an equidigital number, since it uses as much as digits as its factorization.

87957521 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 87957521 is about 9378.5671080395. The cubic root of 87957521 is about 444.7244365567.

The spelling of 87957521 in words is "eighty-seven million, nine hundred fifty-seven thousand, five hundred twenty-one".