213517131 has 12 divisors (see below), whose sum is σ = 287577336. Its totient is φ = 140915200.

The previous prime is 213517091. The next prime is 213517133. The reversal of 213517131 is 131715312.

It is a happy number.

It is not a de Polignac number, because 213517131 - 2⁶ = 213517067 is a prime.

It is a super-2 number, since 2×213517131² = 91179130460942322, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (213517133) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 27115 + ... + 34091.

It is an arithmetic number, because the mean of its divisors is an integer number (23964778).

Almost surely, 2^213517131 is an apocalyptic number.

213517131 is a deficient number, since it is larger than the sum of its proper divisors (74060205).

213517131 is an equidigital number, since it uses as much as digits as its factorization.

213517131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7182 (or 7081 counting only the distinct ones).

The product of its digits is 630, while the sum is 24.

The square root of 213517131 is about 14612.2253951956. The cubic root of 213517131 is about 597.6921818959.

It can be divided in two parts, 21351 and 7131, that added together give a palindrome (28482).

The spelling of 213517131 in words is "two hundred thirteen million, five hundred seventeen thousand, one hundred thirty-one".