213113831 has 4 divisors (see below), whose sum is σ = 243558672. Its totient is φ = 182668992.

The previous prime is 213113783. The next prime is 213113851. The reversal of 213113831 is 138311312.

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 213113831 - 2⁶ = 213113767 is a prime.

It is a super-2 number, since 2×213113831² = 90835009926993122, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 213113797 and 213113806.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (213113851) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15222410 + ... + 15222423.

It is an arithmetic number, because the mean of its divisors is an integer number (60889668).

Almost surely, 2^213113831 is an apocalyptic number.

213113831 is a deficient number, since it is larger than the sum of its proper divisors (30444841).

213113831 is an equidigital number, since it uses as much as digits as its factorization.

213113831 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30444840.

The product of its digits is 432, while the sum is 23.

The square root of 213113831 is about 14598.4187842382. The cubic root of 213113831 is about 597.3156294647.

The spelling of 213113831 in words is "two hundred thirteen million, one hundred thirteen thousand, eight hundred thirty-one".