864525421 has 2 divisors, whose sum is σ = 864525422. Its totient is φ = 864525420.

The previous prime is 864525413. The next prime is 864525437. The reversal of 864525421 is 124525468.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 652240521 + 212284900 = 25539^2 + 14570^2 .

It is a cyclic number.

It is not a de Polignac number, because 864525421 - 2³ = 864525413 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (864525481) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 432262710 + 432262711.

It is an arithmetic number, because the mean of its divisors is an integer number (432262711).

Almost surely, 2^864525421 is an apocalyptic number.

It is an amenable number.

864525421 is a deficient number, since it is larger than the sum of its proper divisors (1).

864525421 is an equidigital number, since it uses as much as digits as its factorization.

864525421 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 76800, while the sum is 37.

The square root of 864525421 is about 29402.8131477245. The cubic root of 864525421 is about 952.6336600780.

The spelling of 864525421 in words is "eight hundred sixty-four million, five hundred twenty-five thousand, four hundred twenty-one".