213111131 has 2 divisors, whose sum is σ = 213111132. Its totient is φ = 213111130.

The previous prime is 213111061. The next prime is 213111149. The reversal of 213111131 is 131111312.

It is a happy number.

It is a m-pointer prime, because the next prime (213111149) can be obtained adding 213111131 to its product of digits (18).

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-213111131 is a prime.

It is a super-2 number, since 2×213111131² = 90832708312198322, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (213111161) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106555565 + 106555566.

It is an arithmetic number, because the mean of its divisors is an integer number (106555566).

Almost surely, 2^213111131 is an apocalyptic number.

213111131 is a deficient number, since it is larger than the sum of its proper divisors (1).

213111131 is an equidigital number, since it uses as much as digits as its factorization.

213111131 is an evil number, because the sum of its binary digits is even.

The product of its digits is 18, while the sum is 14.

The square root of 213111131 is about 14598.3263081766. The cubic root of 213111131 is about 597.3131069332.

Adding to 213111131 its reverse (131111312), we get a palindrome (344222443).

It can be divided in two parts, 2 and 13111131, that multiplied together give a palindrome (26222262).

The spelling of 213111131 in words is "two hundred thirteen million, one hundred eleven thousand, one hundred thirty-one".