1231432131 has 4 divisors (see below), whose sum is σ = 1641909512. Its totient is φ = 820954752.

The previous prime is 1231432117. The next prime is 1231432141. The reversal of 1231432131 is 1312341321.

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

It is not a de Polignac number, because 1231432131 - 2⁶ = 1231432067 is a prime.

It is a super-2 number, since 2×1231432131² = 3032850186518402322, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1231432098 and 1231432107.

It is not an unprimeable number, because it can be changed into a prime (1231432141) 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, 205238686 + ... + 205238691.

It is an arithmetic number, because the mean of its divisors is an integer number (410477378).

Almost surely, 2^1231432131 is an apocalyptic number.

1231432131 is a deficient number, since it is larger than the sum of its proper divisors (410477381).

1231432131 is an equidigital number, since it uses as much as digits as its factorization.

1231432131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 410477380.

The product of its digits is 432, while the sum is 21.

The square root of 1231432131 is about 35091.7672823698. The cubic root of 1231432131 is about 1071.8569469554.

Adding to 1231432131 its reverse (1312341321), we get a palindrome (2543773452).

The spelling of 1231432131 in words is "one billion, two hundred thirty-one million, four hundred thirty-two thousand, one hundred thirty-one".