31073389 has 2 divisors, whose sum is σ = 31073390. Its totient is φ = 31073388.

The previous prime is 31073387. The next prime is 31073411. The reversal of 31073389 is 98337013.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 25704900 + 5368489 = 5070^2 + 2317^2 .

It is an emirp because it is prime and its reverse (98337013) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 31073389 - 2¹ = 31073387 is a prime.

Together with 31073387, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31073387) 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, 15536694 + 15536695.

It is an arithmetic number, because the mean of its divisors is an integer number (15536695).

Almost surely, 2^31073389 is an apocalyptic number.

It is an amenable number.

31073389 is a deficient number, since it is larger than the sum of its proper divisors (1).

31073389 is an equidigital number, since it uses as much as digits as its factorization.

31073389 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 13608, while the sum is 34.

The square root of 31073389 is about 5574.3509936135. The cubic root of 31073389 is about 314.3857653419.

The spelling of 31073389 in words is "thirty-one million, seventy-three thousand, three hundred eighty-nine".