213231131 has 2 divisors, whose sum is σ = 213231132. Its totient is φ = 213231130.

The previous prime is 213231127. The next prime is 213231157. The reversal of 213231131 is 131132312.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 213231131 - 2² = 213231127 is a prime.

It is a super-2 number, since 2×213231131² = 90935030455078322, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (213231121) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106615565 + 106615566.

It is an arithmetic number, because the mean of its divisors is an integer number (106615566).

Almost surely, 2^213231131 is an apocalyptic number.

213231131 is a deficient number, since it is larger than the sum of its proper divisors (1).

213231131 is an equidigital number, since it uses as much as digits as its factorization.

213231131 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 108, while the sum is 17.

The square root of 213231131 is about 14602.4357899633. The cubic root of 213231131 is about 597.4251988782.

Adding to 213231131 its reverse (131132312), we get a palindrome (344363443).

The spelling of 213231131 in words is "two hundred thirteen million, two hundred thirty-one thousand, one hundred thirty-one".