870525421 has 2 divisors, whose sum is σ = 870525422. Its totient is φ = 870525420.

The previous prime is 870525389. The next prime is 870525457. The reversal of 870525421 is 124525078.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 863713321 + 6812100 = 29389^2 + 2610^2 .

It is a cyclic number.

It is not a de Polignac number, because 870525421 - 2⁵ = 870525389 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (870525221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 435262710 + 435262711.

It is an arithmetic number, because the mean of its divisors is an integer number (435262711).

Almost surely, 2^870525421 is an apocalyptic number.

It is an amenable number.

870525421 is a deficient number, since it is larger than the sum of its proper divisors (1).

870525421 is an equidigital number, since it uses as much as digits as its factorization.

870525421 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 22400, while the sum is 34.

The square root of 870525421 is about 29504.6677832508. The cubic root of 870525421 is about 954.8324115891.

The spelling of 870525421 in words is "eight hundred seventy million, five hundred twenty-five thousand, four hundred twenty-one".