87858521 has 2 divisors, whose sum is σ = 87858522. Its totient is φ = 87858520.

The previous prime is 87858509. The next prime is 87858559. The reversal of 87858521 is 12585878.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 80910025 + 6948496 = 8995^2 + 2636^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-87858521 is a prime.

It is a Chen prime.

It is an alternating number because its digits alternate between even and odd.

It is not a weakly prime, because it can be changed into another prime (87858821) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43929260 + 43929261.

It is an arithmetic number, because the mean of its divisors is an integer number (43929261).

Almost surely, 2^87858521 is an apocalyptic number.

It is an amenable number.

87858521 is a deficient number, since it is larger than the sum of its proper divisors (1).

87858521 is an equidigital number, since it uses as much as digits as its factorization.

87858521 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 179200, while the sum is 44.

The square root of 87858521 is about 9373.2876302821. The cubic root of 87858521 is about 444.5575217118.

The spelling of 87858521 in words is "eighty-seven million, eight hundred fifty-eight thousand, five hundred twenty-one".