31120320031 has 4 divisors (see below), whose sum is σ = 31146406992. Its totient is φ = 31094233072.

The previous prime is 31120320017. The next prime is 31120320059. The reversal of 31120320031 is 13002302113.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 13002302113 = 193 ⋅67369441.

It is a cyclic number.

It is not a de Polignac number, because 31120320031 - 2⁵ = 31120319999 is a prime.

It is a super-2 number, since 2×31120320031² (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 = 31120319987 and 31120320014.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31120326031) 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, 13041691 + ... + 13044076.

It is an arithmetic number, because the mean of its divisors is an integer number (7786601748).

Almost surely, 2^31120320031 is an apocalyptic number.

31120320031 is a deficient number, since it is larger than the sum of its proper divisors (26086961).

31120320031 is a wasteful number, since it uses less digits than its factorization.

31120320031 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26086960.

The product of its (nonzero) digits is 108, while the sum is 16.

Adding to 31120320031 its reverse (13002302113), we get a palindrome (44122622144).

The spelling of 31120320031 in words is "thirty-one billion, one hundred twenty million, three hundred twenty thousand, thirty-one".