212766431 has 4 divisors (see below), whose sum is σ = 213328200. Its totient is φ = 212204664.

The previous prime is 212766413. The next prime is 212766461. The reversal of 212766431 is 134667212.

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

It is a cyclic number.

It is not a de Polignac number, because 212766431 - 2²² = 208572127 is a prime.

It is a super-2 number, since 2×212766431² = 90539108320955522, 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 (212766461) 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, 280316 + ... + 281073.

It is an arithmetic number, because the mean of its divisors is an integer number (53332050).

Almost surely, 2^212766431 is an apocalyptic number.

212766431 is a deficient number, since it is larger than the sum of its proper divisors (561769).

212766431 is an equidigital number, since it uses as much as digits as its factorization.

212766431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 561768.

The product of its digits is 12096, while the sum is 32.

The square root of 212766431 is about 14586.5153823660. The cubic root of 212766431 is about 596.9908886058.

The spelling of 212766431 in words is "two hundred twelve million, seven hundred sixty-six thousand, four hundred thirty-one".