1312213031 has 2 divisors, whose sum is σ = 1312213032. Its totient is φ = 1312213030.

The previous prime is 1312213013. The next prime is 1312213057. The reversal of 1312213031 is 1303122131.

Together with previous prime (1312213013) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1312213031 is a prime.

It is a super-2 number, since 2×1312213031² = 3443806077452413922, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1312213531) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 656106515 + 656106516.

It is an arithmetic number, because the mean of its divisors is an integer number (656106516).

Almost surely, 2^1312213031 is an apocalyptic number.

1312213031 is a deficient number, since it is larger than the sum of its proper divisors (1).

1312213031 is an equidigital number, since it uses as much as digits as its factorization.

1312213031 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 108, while the sum is 17.

The square root of 1312213031 is about 36224.4811004934. The cubic root of 1312213031 is about 1094.7999832047.

Adding to 1312213031 its reverse (1303122131), we get a palindrome (2615335162).

The spelling of 1312213031 in words is "one billion, three hundred twelve million, two hundred thirteen thousand, thirty-one".