31326321989 has 2 divisors, whose sum is σ = 31326321990. Its totient is φ = 31326321988.

The previous prime is 31326321907. The next prime is 31326322103. The reversal of 31326321989 is 98912362313.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 31308471364 + 17850625 = 176942^2 + 4225^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31326321989 is a prime.

It is a super-2 number, since 2×31326321989² (a number of 22 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31326321289) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15663160994 + 15663160995.

It is an arithmetic number, because the mean of its divisors is an integer number (15663160995).

Almost surely, 2^31326321989 is an apocalyptic number.

It is an amenable number.

31326321989 is a deficient number, since it is larger than the sum of its proper divisors (1).

31326321989 is an equidigital number, since it uses as much as digits as its factorization.

31326321989 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 419904, while the sum is 47.

The spelling of 31326321989 in words is "thirty-one billion, three hundred twenty-six million, three hundred twenty-one thousand, nine hundred eighty-nine".