1311100231 has 12 divisors (see below), whose sum is σ = 1591728688. Its totient is φ = 1057692672.

The previous prime is 1311100223. The next prime is 1311100243. The reversal of 1311100231 is 1320011131.

It is not a de Polignac number, because 1311100231 - 2³ = 1311100223 is a prime.

It is a super-2 number, since 2×1311100231² = 3437967631456506722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1311100201) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 322026 + ... + 326071.

Almost surely, 2^1311100231 is an apocalyptic number.

1311100231 is a deficient number, since it is larger than the sum of its proper divisors (280628457).

1311100231 is an equidigital number, since it uses as much as digits as its factorization.

1311100231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 648138 (or 648121 counting only the distinct ones).

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

The square root of 1311100231 is about 36209.1180643771. The cubic root of 1311100231 is about 1094.4904201639.

Adding to 1311100231 its reverse (1320011131), we get a palindrome (2631111362).

The spelling of 1311100231 in words is "one billion, three hundred eleven million, one hundred thousand, two hundred thirty-one".