31771903489 has 2 divisors, whose sum is σ = 31771903490. Its totient is φ = 31771903488.

The previous prime is 31771903463. The next prime is 31771903519. The reversal of 31771903489 is 98430917713.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 26959012864 + 4812890625 = 164192^2 + 69375^2 .

It is a cyclic number.

It is not a de Polignac number, because 31771903489 - 2¹³ = 31771895297 is a prime.

It is not a weakly prime, because it can be changed into another prime (31771903409) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15885951744 + 15885951745.

It is an arithmetic number, because the mean of its divisors is an integer number (15885951745).

Almost surely, 2^31771903489 is an apocalyptic number.

It is an amenable number.

31771903489 is a deficient number, since it is larger than the sum of its proper divisors (1).

31771903489 is an equidigital number, since it uses as much as digits as its factorization.

31771903489 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1143072, while the sum is 52.

The spelling of 31771903489 in words is "thirty-one billion, seven hundred seventy-one million, nine hundred three thousand, four hundred eighty-nine".