1311201031 has 4 divisors (see below), whose sum is σ = 1498515472. Its totient is φ = 1123886592.

The previous prime is 1311201013. The next prime is 1311201061. The reversal of 1311201031 is 1301021131.

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 1311201031 - 2⁷ = 1311200903 is a prime.

It is a super-2 number, since 2×1311201031² = 3438496287390925922, 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 (1311201011) 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, 93657210 + ... + 93657223.

It is an arithmetic number, because the mean of its divisors is an integer number (374628868).

Almost surely, 2^1311201031 is an apocalyptic number.

1311201031 is a deficient number, since it is larger than the sum of its proper divisors (187314441).

1311201031 is an equidigital number, since it uses as much as digits as its factorization.

1311201031 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 187314440.

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

The square root of 1311201031 is about 36210.5099522224. The cubic root of 1311201031 is about 1094.5184683137.

Adding to 1311201031 its reverse (1301021131), we get a palindrome (2612222162).

The spelling of 1311201031 in words is "one billion, three hundred eleven million, two hundred one thousand, thirty-one".