1231301331 has 20 divisors (see below), whose sum is σ = 1980841632. Its totient is φ = 757723248.

The previous prime is 1231301329. The next prime is 1231301359. The reversal of 1231301331 is 1331031321.

It is a happy number.

1231301331 is a `hidden beast` number, since 1 + 2 + 31 + 301 + 331 = 666.

It is not a de Polignac number, because 1231301331 - 2¹ = 1231301329 is a prime.

It is a super-2 number, since 2×1231301331² = 3032205935444743122, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1231305331) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 583611 + ... + 585716.

Almost surely, 2^1231301331 is an apocalyptic number.

1231301331 is a deficient number, since it is larger than the sum of its proper divisors (749540301).

1231301331 is a wasteful number, since it uses less digits than its factorization.

1231301331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1169352 (or 1169343 counting only the distinct ones).

The product of its (nonzero) digits is 162, while the sum is 18.

The square root of 1231301331 is about 35089.9035478868. The cubic root of 1231301331 is about 1071.8189955195.

Adding to 1231301331 its reverse (1331031321), we get a palindrome (2562332652).

The spelling of 1231301331 in words is "one billion, two hundred thirty-one million, three hundred one thousand, three hundred thirty-one".