213154631 has 2 divisors, whose sum is σ = 213154632. Its totient is φ = 213154630.

The previous prime is 213154621. The next prime is 213154633. The reversal of 213154631 is 136451312.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-213154631 is a prime.

It is a super-2 number, since 2×213154631² = 90869793433492322, which contains 22 as substring.

Together with 213154633, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 213154631.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (213154633) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106577315 + 106577316.

It is an arithmetic number, because the mean of its divisors is an integer number (106577316).

Almost surely, 2^213154631 is an apocalyptic number.

213154631 is a deficient number, since it is larger than the sum of its proper divisors (1).

213154631 is an equidigital number, since it uses as much as digits as its factorization.

213154631 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2160, while the sum is 26.

The square root of 213154631 is about 14599.8161289792. The cubic root of 213154631 is about 597.3537451241.

The spelling of 213154631 in words is "two hundred thirteen million, one hundred fifty-four thousand, six hundred thirty-one".