31471123517 has 2 divisors, whose sum is σ = 31471123518. Its totient is φ = 31471123516.

The previous prime is 31471123501. The next prime is 31471123549. The reversal of 31471123517 is 71532117413.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18472615396 + 12998508121 = 135914^2 + 114011^2 .

It is a cyclic number.

It is not a de Polignac number, because 31471123517 - 2⁴ = 31471123501 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31471123417) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15735561758 + 15735561759.

It is an arithmetic number, because the mean of its divisors is an integer number (15735561759).

Almost surely, 2^31471123517 is an apocalyptic number.

It is an amenable number.

31471123517 is a deficient number, since it is larger than the sum of its proper divisors (1).

31471123517 is an equidigital number, since it uses as much as digits as its factorization.

31471123517 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 17640, while the sum is 35.

The spelling of 31471123517 in words is "thirty-one billion, four hundred seventy-one million, one hundred twenty-three thousand, five hundred seventeen".