213130531 has 2 divisors, whose sum is σ = 213130532. Its totient is φ = 213130530.

The previous prime is 213130517. The next prime is 213130537. The reversal of 213130531 is 135031312.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 213130531 - 2⁵ = 213130499 is a prime.

It is a super-2 number, since 2×213130531² = 90849246488683922, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 213130499 and 213130508.

It is not a weakly prime, because it can be changed into another prime (213130537) 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 as a sum of consecutive naturals, namely, 106565265 + 106565266.

It is an arithmetic number, because the mean of its divisors is an integer number (106565266).

Almost surely, 2^213130531 is an apocalyptic number.

213130531 is a deficient number, since it is larger than the sum of its proper divisors (1).

213130531 is an equidigital number, since it uses as much as digits as its factorization.

213130531 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 270, while the sum is 19.

The square root of 213130531 is about 14598.9907527884. The cubic root of 213130531 is about 597.3312313153.

Adding to 213130531 its product of nonzero digits (270), we get a square (213130801 = 14599²).

Adding to 213130531 its reverse (135031312), we get a palindrome (348161843).

The spelling of 213130531 in words is "two hundred thirteen million, one hundred thirty thousand, five hundred thirty-one".