1312020031 has 6 divisors (see below), whose sum is σ = 1526227440. Its totient is φ = 1124588556.

The previous prime is 1312020023. The next prime is 1312020043. The reversal of 1312020031 is 1300202131.

It is not a de Polignac number, because 1312020031 - 2³ = 1312020023 is a prime.

It is a super-2 number, since 2×1312020031² = 3442793123490481922, 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 = 1312019993 and 1312020020.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1312000031) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 13387911 + ... + 13388008.

It is an arithmetic number, because the mean of its divisors is an integer number (254371240).

Almost surely, 2^1312020031 is an apocalyptic number.

1312020031 is a deficient number, since it is larger than the sum of its proper divisors (214207409).

1312020031 is an equidigital number, since it uses as much as digits as its factorization.

1312020031 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26775933 (or 26775926 counting only the distinct ones).

The product of its (nonzero) digits is 36, while the sum is 13.

The square root of 1312020031 is about 36221.8170582316. The cubic root of 1312020031 is about 1094.7463062605.

Adding to 1312020031 its reverse (1300202131), we get a palindrome (2612222162).

The spelling of 1312020031 in words is "one billion, three hundred twelve million, twenty thousand, thirty-one".