31111020001 has 6 divisors (see below), whose sum is σ = 31422110006. Its totient is φ = 30802980000.

The previous prime is 31111019963. The next prime is 31111020019. The reversal of 31111020001 is 10002011113.

It can be written as a sum of positive squares in 3 ways, for example, as 28655718400 + 2455301601 = 169280^2 + 49551^2 .

It is not a de Polignac number, because 31111020001 - 2²⁵ = 31077465569 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 31111020001.

It is not an unprimeable number, because it can be changed into a prime (31111020041) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1514700 + ... + 1535101.

Almost surely, 2^31111020001 is an apocalyptic number.

It is an amenable number.

31111020001 is a deficient number, since it is larger than the sum of its proper divisors (311090005).

31111020001 is an equidigital number, since it uses as much as digits as its factorization.

31111020001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3050003 (or 3049902 counting only the distinct ones).

The product of its (nonzero) digits is 6, while the sum is 10.

Adding to 31111020001 its reverse (10002011113), we get a palindrome (41113031114).

The spelling of 31111020001 in words is "thirty-one billion, one hundred eleven million, twenty thousand, one".