1311020031 has 8 divisors (see below), whose sum is σ = 1781008560. Its totient is φ = 857522432.

The previous prime is 1311020017. The next prime is 1311020047. The reversal of 1311020031 is 1300201131.

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 1311020031 - 2⁵ = 1311019999 is a prime.

It is a super-2 number, since 2×1311020031² = 3437547043366481922, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1311019989 and 1311020016.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1311020731) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4122546 + ... + 4122863.

It is an arithmetic number, because the mean of its divisors is an integer number (222626070).

Almost surely, 2^1311020031 is an apocalyptic number.

1311020031 is a deficient number, since it is larger than the sum of its proper divisors (469988529).

1311020031 is an equidigital number, since it uses as much as digits as its factorization.

1311020031 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8245465.

The product of its (nonzero) digits is 18, while the sum is 12.

The square root of 1311020031 is about 36208.0105915804. The cubic root of 1311020031 is about 1094.4681030495.

Adding to 1311020031 its reverse (1300201131), we get a palindrome (2611221162).

The spelling of 1311020031 in words is "one billion, three hundred eleven million, twenty thousand, thirty-one".