31002020111 has 16 divisors (see below), whose sum is σ = 33140959200. Its totient is φ = 28915273728.

The previous prime is 31002020089. The next prime is 31002020117. The reversal of 31002020111 is 11102020013.

It is a de Polignac number, because none of the positive numbers 2^k-31002020111 is a prime.

It is a super-2 number, since 2×31002020111² (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 = 31002020092 and 31002020101.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31002020117) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 752495 + ... + 792623.

It is an arithmetic number, because the mean of its divisors is an integer number (2071309950).

Almost surely, 2^31002020111 is an apocalyptic number.

31002020111 is a deficient number, since it is larger than the sum of its proper divisors (2138939089).

31002020111 is a wasteful number, since it uses less digits than its factorization.

31002020111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40778.

The product of its (nonzero) digits is 12, while the sum is 11.

Adding to 31002020111 its reverse (11102020013), we get a palindrome (42104040124).

The spelling of 31002020111 in words is "thirty-one billion, two million, twenty thousand, one hundred eleven".