121231131 has 16 divisors (see below), whose sum is σ = 195600384. Its totient is φ = 65199744.

The previous prime is 121231093. The next prime is 121231133. The reversal of 121231131 is 131132121.

It is a happy number.

It is not a de Polignac number, because 121231131 - 2⁷ = 121231003 is a prime.

It is a super-2 number, since 2×121231131² = 29393974247078322, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 121231131.

It is not an unprimeable number, because it can be changed into a prime (121231133) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 169435 + ... + 170148.

It is an arithmetic number, because the mean of its divisors is an integer number (12225024).

Almost surely, 2^121231131 is an apocalyptic number.

121231131 is a deficient number, since it is larger than the sum of its proper divisors (74369253).

121231131 is a wasteful number, since it uses less digits than its factorization.

121231131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 339610.

The product of its digits is 36, while the sum is 15.

The square root of 121231131 is about 11010.5009422823. The cubic root of 121231131 is about 494.9234735283.

Adding to 121231131 its reverse (131132121), we get a palindrome (252363252).

The spelling of 121231131 in words is "one hundred twenty-one million, two hundred thirty-one thousand, one hundred thirty-one".