213694331 has 2 divisors, whose sum is σ = 213694332. Its totient is φ = 213694330.

The previous prime is 213694307. The next prime is 213694343. The reversal of 213694331 is 133496312.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-213694331 is a prime.

It is a super-2 number, since 2×213694331² = 91330534203075122, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (213694531) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106847165 + 106847166.

It is an arithmetic number, because the mean of its divisors is an integer number (106847166).

Almost surely, 2^213694331 is an apocalyptic number.

213694331 is a deficient number, since it is larger than the sum of its proper divisors (1).

213694331 is an equidigital number, since it uses as much as digits as its factorization.

213694331 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 11664, while the sum is 32.

The square root of 213694331 is about 14618.2875536090. The cubic root of 213694331 is about 597.8574797477.

The spelling of 213694331 in words is "two hundred thirteen million, six hundred ninety-four thousand, three hundred thirty-one".