31020111013 has 2 divisors, whose sum is σ = 31020111014. Its totient is φ = 31020111012.

The previous prime is 31020110981. The next prime is 31020111077. The reversal of 31020111013 is 31011102013.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 29106748449 + 1913362564 = 170607^2 + 43742^2 .

It is a cyclic number.

It is not a de Polignac number, because 31020111013 - 2⁵ = 31020110981 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 31020110984 and 31020111002.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31020111313) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15510055506 + 15510055507.

It is an arithmetic number, because the mean of its divisors is an integer number (15510055507).

Almost surely, 2^31020111013 is an apocalyptic number.

It is an amenable number.

31020111013 is a deficient number, since it is larger than the sum of its proper divisors (1).

31020111013 is an equidigital number, since it uses as much as digits as its factorization.

31020111013 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 18, while the sum is 13.

Adding to 31020111013 its reverse (31011102013), we get a palindrome (62031213026).

The spelling of 31020111013 in words is "thirty-one billion, twenty million, one hundred eleven thousand, thirteen".