1311020131 has 4 divisors (see below), whose sum is σ = 1311157072. Its totient is φ = 1310883192.

The previous prime is 1311020099. The next prime is 1311020147. The reversal of 1311020131 is 1310201131.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1311020131 - 2⁵ = 1311020099 is a prime.

It is a super-2 number, since 2×1311020131² = 3437547567774514322, which contains 22 as substring.

It is a Duffinian number.

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

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 52935 + ... + 73648.

It is an arithmetic number, because the mean of its divisors is an integer number (327789268).

Almost surely, 2^1311020131 is an apocalyptic number.

1311020131 is a deficient number, since it is larger than the sum of its proper divisors (136941).

1311020131 is a wasteful number, since it uses less digits than its factorization.

1311020131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 136940.

The product of its (nonzero) digits is 18, while the sum is 13.

The square root of 1311020131 is about 36208.0119724903. The cubic root of 1311020131 is about 1094.4681308769.

Adding to 1311020131 its reverse (1310201131), we get a palindrome (2621221262).

The spelling of 1311020131 in words is "one billion, three hundred eleven million, twenty thousand, one hundred thirty-one".