31020012169 has 2 divisors, whose sum is σ = 31020012170. Its totient is φ = 31020012168.

The previous prime is 31020012157. The next prime is 31020012211. The reversal of 31020012169 is 96121002013.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 22115258944 + 8904753225 = 148712^2 + 94365^2 .

It is a cyclic number.

It is not a de Polignac number, because 31020012169 - 2¹⁵ = 31019979401 is a prime.

It is a super-2 number, since 2×31020012169² (a number of 22 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (31020010169) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15510006084 + 15510006085.

It is an arithmetic number, because the mean of its divisors is an integer number (15510006085).

Almost surely, 2^31020012169 is an apocalyptic number.

It is an amenable number.

31020012169 is a deficient number, since it is larger than the sum of its proper divisors (1).

31020012169 is an equidigital number, since it uses as much as digits as its factorization.

31020012169 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 648, while the sum is 25.

The spelling of 31020012169 in words is "thirty-one billion, twenty million, twelve thousand, one hundred sixty-nine".