1312021031 has 8 divisors (see below), whose sum is σ = 1351430784. Its totient is φ = 1273015800.

The previous prime is 1312021021. The next prime is 1312021037. The reversal of 1312021031 is 1301202131.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1312021031 - 2¹⁸ = 1311758887 is a prime.

It is a super-2 number, since 2×1312021031² = 3442798371572605922, 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 = 1312020997 and 1312021015.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1312021037) 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 7 ways as a sum of consecutive naturals, for example, 94541 + ... + 107526.

It is an arithmetic number, because the mean of its divisors is an integer number (168928848).

Almost surely, 2^1312021031 is an apocalyptic number.

1312021031 is a deficient number, since it is larger than the sum of its proper divisors (39409753).

1312021031 is a wasteful number, since it uses less digits than its factorization.

1312021031 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 202261.

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

The square root of 1312021031 is about 36221.8308620644. The cubic root of 1312021031 is about 1094.7465843930.

Adding to 1312021031 its reverse (1301202131), we get a palindrome (2613223162).

The spelling of 1312021031 in words is "one billion, three hundred twelve million, twenty-one thousand, thirty-one".