212951631 has 4 divisors (see below), whose sum is σ = 283935512. Its totient is φ = 141967752.

The previous prime is 212951623. The next prime is 212951647. The reversal of 212951631 is 136159212.

212951631 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 212951631 - 2³ = 212951623 is a prime.

It is a super-2 number, since 2×212951631² = 90696794291120322, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212951621) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 35491936 + ... + 35491941.

It is an arithmetic number, because the mean of its divisors is an integer number (70983878).

Almost surely, 2^212951631 is an apocalyptic number.

212951631 is a deficient number, since it is larger than the sum of its proper divisors (70983881).

212951631 is an equidigital number, since it uses as much as digits as its factorization.

212951631 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 70983880.

The product of its digits is 3240, while the sum is 30.

The square root of 212951631 is about 14592.8623306053. The cubic root of 212951631 is about 597.1640529034.

The spelling of 212951631 in words is "two hundred twelve million, nine hundred fifty-one thousand, six hundred thirty-one".