1312311020231 has 4 divisors (see below), whose sum is σ = 1312321567200. Its totient is φ = 1312300473264.

The previous prime is 1312311020221. The next prime is 1312311020239. The reversal of 1312311020231 is 1320201132131.

It is a happy number.

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-1312311020231 is a prime.

It is a super-2 number, since 2×1312311020231² (a number of 25 digits) 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 (1312311020239) 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, 5084591 + ... + 5336448.

It is an arithmetic number, because the mean of its divisors is an integer number (328080391800).

Almost surely, 2^{1312311020231} is an apocalyptic number.

1312311020231 is a deficient number, since it is larger than the sum of its proper divisors (10546969).

1312311020231 is a wasteful number, since it uses less digits than its factorization.

1312311020231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10546968.

The product of its (nonzero) digits is 216, while the sum is 20.

Adding to 1312311020231 its reverse (1320201132131), we get a palindrome (2632512152362).

The spelling of 1312311020231 in words is "one trillion, three hundred twelve billion, three hundred eleven million, twenty thousand, two hundred thirty-one".