31946354989 has 2 divisors, whose sum is σ = 31946354990. Its totient is φ = 31946354988.

The previous prime is 31946354981. The next prime is 31946355017. The reversal of 31946354989 is 98945364913.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 22813685764 + 9132669225 = 151042^2 + 95565^2 .

It is an emirp because it is prime and its reverse (98945364913) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 31946354989 - 2³ = 31946354981 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31946354981) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15973177494 + 15973177495.

It is an arithmetic number, because the mean of its divisors is an integer number (15973177495).

Almost surely, 2^31946354989 is an apocalyptic number.

It is an amenable number.

31946354989 is a deficient number, since it is larger than the sum of its proper divisors (1).

31946354989 is an equidigital number, since it uses as much as digits as its factorization.

31946354989 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 25194240, while the sum is 61.

The spelling of 31946354989 in words is "thirty-one billion, nine hundred forty-six million, three hundred fifty-four thousand, nine hundred eighty-nine".