1231406957 has 6 divisors (see below), whose sum is σ = 1353530094. Its totient is φ = 1119460760.

The previous prime is 1231406923. The next prime is 1231406983. The reversal of 1231406957 is 7596041321.

It can be written as a sum of positive squares in only one way, i.e., 1035938596 + 195468361 = 32186^2 + 13981^2 .

It is not a de Polignac number, because 1231406957 - 2¹⁸ = 1231144813 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1231406957.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1231406557) 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 5 ways as a sum of consecutive naturals, for example, 5088338 + ... + 5088579.

It is an arithmetic number, because the mean of its divisors is an integer number (225588349).

Almost surely, 2^1231406957 is an apocalyptic number.

It is an amenable number.

1231406957 is a deficient number, since it is larger than the sum of its proper divisors (122123137).

1231406957 is a wasteful number, since it uses less digits than its factorization.

1231406957 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10176939 (or 10176928 counting only the distinct ones).

The product of its (nonzero) digits is 45360, while the sum is 38.

The square root of 1231406957 is about 35091.4085924176. The cubic root of 1231406957 is about 1071.8496429636.

The spelling of 1231406957 in words is "one billion, two hundred thirty-one million, four hundred six thousand, nine hundred fifty-seven".