31001321011 has 4 divisors (see below), whose sum is σ = 31014878752. Its totient is φ = 30987763272.

The previous prime is 31001320991. The next prime is 31001321041. The reversal of 31001321011 is 11012310013.

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 31001321011 - 2²⁵ = 30967766579 is a prime.

It is a super-2 number, since 2×31001321011² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 31001320982 and 31001321000.

It is not an unprimeable number, because it can be changed into a prime (31001321041) 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, 6775440 + ... + 6780013.

It is an arithmetic number, because the mean of its divisors is an integer number (7753719688).

Almost surely, 2^31001321011 is an apocalyptic number.

31001321011 is a deficient number, since it is larger than the sum of its proper divisors (13557741).

31001321011 is a wasteful number, since it uses less digits than its factorization.

31001321011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13557740.

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

Adding to 31001321011 its reverse (11012310013), we get a palindrome (42013631024).

The spelling of 31001321011 in words is "thirty-one billion, one million, three hundred twenty-one thousand, eleven".