212890631 has 2 divisors, whose sum is σ = 212890632. Its totient is φ = 212890630.

The previous prime is 212890621. The next prime is 212890633. The reversal of 212890631 is 136098212.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 212890631 - 2⁶ = 212890567 is a prime.

It is a super-2 number, since 2×212890631² = 90644841535156322, which contains 22 as substring.

Together with 212890633, 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 (212890633) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106445315 + 106445316.

It is an arithmetic number, because the mean of its divisors is an integer number (106445316).

Almost surely, 2^212890631 is an apocalyptic number.

212890631 is a deficient number, since it is larger than the sum of its proper divisors (1).

212890631 is an equidigital number, since it uses as much as digits as its factorization.

212890631 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5184, while the sum is 32.

The square root of 212890631 is about 14590.7721180203. The cubic root of 212890631 is about 597.1070282389.

The spelling of 212890631 in words is "two hundred twelve million, eight hundred ninety thousand, six hundred thirty-one".