212789431 has 4 divisors (see below), whose sum is σ = 213162664. Its totient is φ = 212416200.

The previous prime is 212789419. The next prime is 212789449. The reversal of 212789431 is 134987212.

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 212789431 - 2¹⁷ = 212658359 is a prime.

It is a super-2 number, since 2×212789431² = 90558683890607522, 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 (212789131) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 185760 + ... + 186901.

It is an arithmetic number, because the mean of its divisors is an integer number (53290666).

Almost surely, 2^212789431 is an apocalyptic number.

212789431 is a deficient number, since it is larger than the sum of its proper divisors (373233).

212789431 is an equidigital number, since it uses as much as digits as its factorization.

212789431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 373232.

The product of its digits is 24192, while the sum is 37.

The square root of 212789431 is about 14587.3037604624. The cubic root of 212789431 is about 597.0123993545.

The spelling of 212789431 in words is "two hundred twelve million, seven hundred eighty-nine thousand, four hundred thirty-one".