1311235131 has 16 divisors (see below), whose sum is σ = 1769554080. Its totient is φ = 863554560.

The previous prime is 1311235111. The next prime is 1311235139. The reversal of 1311235131 is 1315321131.

It is not a de Polignac number, because 1311235131 - 2⁵ = 1311235099 is a prime.

It is a super-2 number, since 2×1311235131² = 3438675137537174322, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1311235098 and 1311235107.

It is not an unprimeable number, because it can be changed into a prime (1311235139) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 573711 + ... + 575991.

It is an arithmetic number, because the mean of its divisors is an integer number (110597130).

Almost surely, 2^1311235131 is an apocalyptic number.

1311235131 is a deficient number, since it is larger than the sum of its proper divisors (458318949).

1311235131 is a wasteful number, since it uses less digits than its factorization.

1311235131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4526.

The product of its digits is 270, while the sum is 21.

The square root of 1311235131 is about 36210.9808069320. The cubic root of 1311235131 is about 1094.5279564993.

Adding to 1311235131 its reverse (1315321131), we get a palindrome (2626556262).

The spelling of 1311235131 in words is "one billion, three hundred eleven million, two hundred thirty-five thousand, one hundred thirty-one".