1331235131 has 4 divisors (see below), whose sum is σ = 1336041312. Its totient is φ = 1326428952.

The previous prime is 1331235121. The next prime is 1331235137. The reversal of 1331235131 is 1315321331.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1331235131 is a prime.

It is a super-2 number, since 2×1331235131² = 3544373948017174322, 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 = 1331235097 and 1331235106.

It is not an unprimeable number, because it can be changed into a prime (1331235137) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2402675 + ... + 2403228.

It is an arithmetic number, because the mean of its divisors is an integer number (334010328).

Almost surely, 2^1331235131 is an apocalyptic number.

1331235131 is a deficient number, since it is larger than the sum of its proper divisors (4806181).

1331235131 is an equidigital number, since it uses as much as digits as its factorization.

1331235131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4806180.

The product of its digits is 810, while the sum is 23.

The square root of 1331235131 is about 36486.0950363286. The cubic root of 1331235131 is about 1100.0647705662.

Adding to 1331235131 its reverse (1315321331), we get a palindrome (2646556462).

The spelling of 1331235131 in words is "one billion, three hundred thirty-one million, two hundred thirty-five thousand, one hundred thirty-one".