213497831 has 2 divisors, whose sum is σ = 213497832. Its totient is φ = 213497830.

The previous prime is 213497827. The next prime is 213497861. The reversal of 213497831 is 138794312.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 213497831 - 2² = 213497827 is a prime.

It is a super-3 number, since 3×213497831³ (a number of 26 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (213497861) 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, 106748915 + 106748916.

It is an arithmetic number, because the mean of its divisors is an integer number (106748916).

Almost surely, 2^213497831 is an apocalyptic number.

213497831 is a deficient number, since it is larger than the sum of its proper divisors (1).

213497831 is an equidigital number, since it uses as much as digits as its factorization.

213497831 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 36288, while the sum is 38.

The square root of 213497831 is about 14611.5649743619. The cubic root of 213497831 is about 597.6741727138.

The spelling of 213497831 in words is "two hundred thirteen million, four hundred ninety-seven thousand, eight hundred thirty-one".