31020123313 has 4 divisors (see below), whose sum is σ = 31050153508. Its totient is φ = 30990093120.

The previous prime is 31020123301. The next prime is 31020123347. The reversal of 31020123313 is 31332102013.

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 18675135649 + 12344987664 = 136657^2 + 111108^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31020123313 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31020123373) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15013548 + ... + 15015613.

It is an arithmetic number, because the mean of its divisors is an integer number (7762538377).

Almost surely, 2^31020123313 is an apocalyptic number.

It is an amenable number.

31020123313 is a deficient number, since it is larger than the sum of its proper divisors (30030195).

31020123313 is a wasteful number, since it uses less digits than its factorization.

31020123313 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30030194.

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

Adding to 31020123313 its reverse (31332102013), we get a palindrome (62352225326).

The spelling of 31020123313 in words is "thirty-one billion, twenty million, one hundred twenty-three thousand, three hundred thirteen".