31123303313 has 4 divisors (see below), whose sum is σ = 31131397440. Its totient is φ = 31115209188.

The previous prime is 31123303223. The next prime is 31123303339. The reversal of 31123303313 is 31330332113.

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 a de Polignac number, because none of the positive numbers 2^k-31123303313 is a prime.

It is a super-2 number, since 2×31123303313² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31123305313) 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, 4041293 + ... + 4048986.

It is an arithmetic number, because the mean of its divisors is an integer number (7782849360).

Almost surely, 2^31123303313 is an apocalyptic number.

It is an amenable number.

31123303313 is a deficient number, since it is larger than the sum of its proper divisors (8094127).

31123303313 is an equidigital number, since it uses as much as digits as its factorization.

31123303313 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8094126.

The product of its (nonzero) digits is 1458, while the sum is 23.

Adding to 31123303313 its reverse (31330332113), we get a palindrome (62453635426).

The spelling of 31123303313 in words is "thirty-one billion, one hundred twenty-three million, three hundred three thousand, three hundred thirteen".