213815131 has 2 divisors, whose sum is σ = 213815132. Its totient is φ = 213815130.

The previous prime is 213815117. The next prime is 213815167. The reversal of 213815131 is 131518312.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 213815131 - 2⁵ = 213815099 is a prime.

It is a super-2 number, since 2×213815131² = 91433820489094322, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 213815096 and 213815105.

It is not a weakly prime, because it can be changed into another prime (213815111) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106907565 + 106907566.

It is an arithmetic number, because the mean of its divisors is an integer number (106907566).

Almost surely, 2^213815131 is an apocalyptic number.

213815131 is a deficient number, since it is larger than the sum of its proper divisors (1).

213815131 is an equidigital number, since it uses as much as digits as its factorization.

213815131 is an evil number, because the sum of its binary digits is even.

The product of its digits is 720, while the sum is 25.

The square root of 213815131 is about 14622.4187807626. The cubic root of 213815131 is about 597.9701134939.

The spelling of 213815131 in words is "two hundred thirteen million, eight hundred fifteen thousand, one hundred thirty-one".