1231869131 has 2 divisors, whose sum is σ = 1231869132. Its totient is φ = 1231869130.

The previous prime is 1231869127. The next prime is 1231869173. The reversal of 1231869131 is 1319681321.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1231869131 - 2² = 1231869127 is a prime.

It is a super-2 number, since 2×1231869131² = 3035003111821390322, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1231869091 and 1231869100.

It is not a weakly prime, because it can be changed into another prime (1231869101) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 615934565 + 615934566.

It is an arithmetic number, because the mean of its divisors is an integer number (615934566).

Almost surely, 2^1231869131 is an apocalyptic number.

1231869131 is a deficient number, since it is larger than the sum of its proper divisors (1).

1231869131 is an equidigital number, since it uses as much as digits as its factorization.

1231869131 is an evil number, because the sum of its binary digits is even.

The product of its digits is 7776, while the sum is 35.

The square root of 1231869131 is about 35097.9932617237. The cubic root of 1231869131 is about 1071.9837224059.

The spelling of 1231869131 in words is "one billion, two hundred thirty-one million, eight hundred sixty-nine thousand, one hundred thirty-one".