31740389 has 2 divisors, whose sum is σ = 31740390. Its totient is φ = 31740388.

The previous prime is 31740367. The next prime is 31740419. The reversal of 31740389 is 98304713.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 24423364 + 7317025 = 4942^2 + 2705^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31740389 is a prime.

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 (31748389) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15870194 + 15870195.

It is an arithmetic number, because the mean of its divisors is an integer number (15870195).

Almost surely, 2^31740389 is an apocalyptic number.

It is an amenable number.

31740389 is a deficient number, since it is larger than the sum of its proper divisors (1).

31740389 is an equidigital number, since it uses as much as digits as its factorization.

31740389 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 18144, while the sum is 35.

The square root of 31740389 is about 5633.8609319010. The cubic root of 31740389 is about 316.6193223156.

The spelling of 31740389 in words is "thirty-one million, seven hundred forty thousand, three hundred eighty-nine".