31103220313 has 4 divisors (see below), whose sum is σ = 33930785808. Its totient is φ = 28275654820.

The previous prime is 31103220311. The next prime is 31103220319. The reversal of 31103220313 is 31302230113.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 31103220313 - 2¹ = 31103220311 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31103220311) 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, 1413782731 + ... + 1413782752.

It is an arithmetic number, because the mean of its divisors is an integer number (8482696452).

Almost surely, 2^31103220313 is an apocalyptic number.

It is an amenable number.

31103220313 is a deficient number, since it is larger than the sum of its proper divisors (2827565495).

31103220313 is a wasteful number, since it uses less digits than its factorization.

31103220313 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2827565494.

The product of its (nonzero) digits is 324, while the sum is 19.

Adding to 31103220313 its reverse (31302230113), we get a palindrome (62405450426).

The spelling of 31103220313 in words is "thirty-one billion, one hundred three million, two hundred twenty thousand, three hundred thirteen".