1222431131 has 4 divisors (see below), whose sum is σ = 1248440352. Its totient is φ = 1196421912.

The previous prime is 1222431127. The next prime is 1222431137. The reversal of 1222431131 is 1311342221.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1222431131 - 2² = 1222431127 is a prime.

It is a super-2 number, since 2×1222431131² = 2988675740075878322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1222431137) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13004540 + ... + 13004633.

It is an arithmetic number, because the mean of its divisors is an integer number (312110088).

Almost surely, 2^1222431131 is an apocalyptic number.

1222431131 is a deficient number, since it is larger than the sum of its proper divisors (26009221).

1222431131 is an equidigital number, since it uses as much as digits as its factorization.

1222431131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26009220.

The product of its digits is 288, while the sum is 20.

The square root of 1222431131 is about 34963.2826119059. The cubic root of 1222431131 is about 1069.2390230806.

Adding to 1222431131 its reverse (1311342221), we get a palindrome (2533773352).

The spelling of 1222431131 in words is "one billion, two hundred twenty-two million, four hundred thirty-one thousand, one hundred thirty-one".