1231301311 has 4 divisors (see below), whose sum is σ = 1234467000. Its totient is φ = 1228135624.

The previous prime is 1231301303. The next prime is 1231301329. The reversal of 1231301311 is 1131031321.

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 1231301311 - 2³ = 1231301303 is a prime.

It is a super-3 number, since 3×1231301311³ (a number of 28 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1231301011) 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, 1582261 + ... + 1583038.

It is an arithmetic number, because the mean of its divisors is an integer number (308616750).

Almost surely, 2^1231301311 is an apocalyptic number.

1231301311 is a deficient number, since it is larger than the sum of its proper divisors (3165689).

1231301311 is an equidigital number, since it uses as much as digits as its factorization.

1231301311 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3165688.

The product of its (nonzero) digits is 54, while the sum is 16.

The square root of 1231301311 is about 35089.9032629046. The cubic root of 1231301311 is about 1071.8189897164.

Adding to 1231301311 its reverse (1131031321), we get a palindrome (2362332632).

The spelling of 1231301311 in words is "one billion, two hundred thirty-one million, three hundred one thousand, three hundred eleven".