15312989 has 2 divisors, whose sum is σ = 15312990. Its totient is φ = 15312988.

The previous prime is 15312959. The next prime is 15313019. The reversal of 15312989 is 98921351.

It is a balanced prime because it is at equal distance from previous prime (15312959) and next prime (15313019).

It can be written as a sum of positive squares in only one way, i.e., 9504889 + 5808100 = 3083^2 + 2410^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-15312989 is a prime.

It is a super-2 number, since 2×15312989² = 468975264228242, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Chen 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 (15312959) 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, 7656494 + 7656495.

It is an arithmetic number, because the mean of its divisors is an integer number (7656495).

Almost surely, 2^15312989 is an apocalyptic number.

It is an amenable number.

15312989 is a deficient number, since it is larger than the sum of its proper divisors (1).

15312989 is an equidigital number, since it uses as much as digits as its factorization.

15312989 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 19440, while the sum is 38.

The square root of 15312989 is about 3913.1814422539. The cubic root of 15312989 is about 248.3247404301.

The spelling of 15312989 in words is "fifteen million, three hundred twelve thousand, nine hundred eighty-nine".