31113001321 has 4 divisors (see below), whose sum is σ = 31164770644. Its totient is φ = 31061232000.

The previous prime is 31113001319. The next prime is 31113001357. The reversal of 31113001321 is 12310031113.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 10365479721 + 20747521600 = 101811^2 + 144040^2 .

It is a cyclic number.

It is not a de Polignac number, because 31113001321 - 2¹ = 31113001319 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 31113001295 and 31113001304.

It is not an unprimeable number, because it can be changed into a prime (31113001021) 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, 25883760 + ... + 25884961.

It is an arithmetic number, because the mean of its divisors is an integer number (7791192661).

Almost surely, 2^31113001321 is an apocalyptic number.

It is an amenable number.

31113001321 is a deficient number, since it is larger than the sum of its proper divisors (51769323).

31113001321 is an equidigital number, since it uses as much as digits as its factorization.

31113001321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51769322.

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

Adding to 31113001321 its reverse (12310031113), we get a palindrome (43423032434).

The spelling of 31113001321 in words is "thirty-one billion, one hundred thirteen million, one thousand, three hundred twenty-one".