1231120031 has 2 divisors, whose sum is σ = 1231120032. Its totient is φ = 1231120030.

The previous prime is 1231120027. The next prime is 1231120061. The reversal of 1231120031 is 1300211321.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1231120031 - 2² = 1231120027 is a prime.

It is a super-2 number, since 2×1231120031² = 3031313061458881922, which contains 22 as substring.

It is a Sophie Germain prime.

It is a junction number, because it is equal to n+sod(n) for n = 1231119988 and 1231120015.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1231120061) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 615560015 + 615560016.

It is an arithmetic number, because the mean of its divisors is an integer number (615560016).

Almost surely, 2^1231120031 is an apocalyptic number.

1231120031 is a deficient number, since it is larger than the sum of its proper divisors (1).

1231120031 is an equidigital number, since it uses as much as digits as its factorization.

1231120031 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 36, while the sum is 14.

The square root of 1231120031 is about 35087.3200886018. The cubic root of 1231120031 is about 1071.7663871349.

Adding to 1231120031 its reverse (1300211321), we get a palindrome (2531331352).

The spelling of 1231120031 in words is "one billion, two hundred thirty-one million, one hundred twenty thousand, thirty-one".