213192831 has 4 divisors (see below), whose sum is σ = 284257112. Its totient is φ = 142128552.

The previous prime is 213192827. The next prime is 213192851. The reversal of 213192831 is 138291312.

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

It is not a de Polignac number, because 213192831 - 2² = 213192827 is a prime.

It is a super-2 number, since 2×213192831² = 90902366379589122, 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 (213192851) 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, 35532136 + ... + 35532141.

It is an arithmetic number, because the mean of its divisors is an integer number (71064278).

Almost surely, 2^213192831 is an apocalyptic number.

213192831 is a deficient number, since it is larger than the sum of its proper divisors (71064281).

213192831 is an equidigital number, since it uses as much as digits as its factorization.

213192831 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 71064280.

The product of its digits is 2592, while the sum is 30.

The square root of 213192831 is about 14601.1243060252. The cubic root of 213192831 is about 597.3894274360.

The spelling of 213192831 in words is "two hundred thirteen million, one hundred ninety-two thousand, eight hundred thirty-one".