213772631 has 2 divisors, whose sum is σ = 213772632. Its totient is φ = 213772630.

The previous prime is 213772627. The next prime is 213772633. The reversal of 213772631 is 136277312.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 213772631 - 2² = 213772627 is a prime.

It is a super-2 number, since 2×213772631² = 91397475529324322, which contains 22 as substring.

It is a Sophie Germain prime.

Together with 213772633, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (213772633) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106886315 + 106886316.

It is an arithmetic number, because the mean of its divisors is an integer number (106886316).

Almost surely, 2^213772631 is an apocalyptic number.

213772631 is a deficient number, since it is larger than the sum of its proper divisors (1).

213772631 is an equidigital number, since it uses as much as digits as its factorization.

213772631 is an evil number, because the sum of its binary digits is even.

The product of its digits is 10584, while the sum is 32.

The square root of 213772631 is about 14620.9654605980. The cubic root of 213772631 is about 597.9304913934.

The spelling of 213772631 in words is "two hundred thirteen million, seven hundred seventy-two thousand, six hundred thirty-one".