1020031013231 has 4 divisors (see below), whose sum is σ = 1047599419032. Its totient is φ = 992462607432.

The previous prime is 1020031013191. The next prime is 1020031013233. The reversal of 1020031013231 is 1323101300201.

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-1020031013231 is a prime.

It is a super-2 number, since 2×1020031013231² (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 (1020031013233) 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, 13784202845 + ... + 13784202918.

It is an arithmetic number, because the mean of its divisors is an integer number (261899854758).

Almost surely, 2^{1020031013231} is an apocalyptic number.

1020031013231 is a deficient number, since it is larger than the sum of its proper divisors (27568405801).

1020031013231 is an equidigital number, since it uses as much as digits as its factorization.

1020031013231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27568405800.

The product of its (nonzero) digits is 108, while the sum is 17.

Adding to 1020031013231 its reverse (1323101300201), we get a palindrome (2343132313432).

The spelling of 1020031013231 in words is "one trillion, twenty billion, thirty-one million, thirteen thousand, two hundred thirty-one".