857326621 has 2 divisors, whose sum is σ = 857326622. Its totient is φ = 857326620.

The previous prime is 857326601. The next prime is 857326637. The reversal of 857326621 is 126623758.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 473715225 + 383611396 = 21765^2 + 19586^2 .

It is a cyclic number.

It is not a de Polignac number, because 857326621 - 2²¹ = 855229469 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (857326601) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 428663310 + 428663311.

It is an arithmetic number, because the mean of its divisors is an integer number (428663311).

Almost surely, 2^857326621 is an apocalyptic number.

It is an amenable number.

857326621 is a deficient number, since it is larger than the sum of its proper divisors (1).

857326621 is an equidigital number, since it uses as much as digits as its factorization.

857326621 is an evil number, because the sum of its binary digits is even.

The product of its digits is 120960, while the sum is 40.

The square root of 857326621 is about 29280.1403855924. The cubic root of 857326621 is about 949.9821311505.

The spelling of 857326621 in words is "eight hundred fifty-seven million, three hundred twenty-six thousand, six hundred twenty-one".