213023857 has 2 divisors, whose sum is σ = 213023858. Its totient is φ = 213023856.

The previous prime is 213023843. The next prime is 213023893. The reversal of 213023857 is 758320312.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 193655056 + 19368801 = 13916^2 + 4401^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-213023857 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (213023827) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106511928 + 106511929.

It is an arithmetic number, because the mean of its divisors is an integer number (106511929).

Almost surely, 2^213023857 is an apocalyptic number.

It is an amenable number.

213023857 is a deficient number, since it is larger than the sum of its proper divisors (1).

213023857 is an equidigital number, since it uses as much as digits as its factorization.

213023857 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 10080, while the sum is 31.

The square root of 213023857 is about 14595.3368237941. The cubic root of 213023857 is about 597.2315578973.

The spelling of 213023857 in words is "two hundred thirteen million, twenty-three thousand, eight hundred fifty-seven".