15312889 has 2 divisors, whose sum is σ = 15312890. Its totient is φ = 15312888.

The previous prime is 15312887. The next prime is 15312959. The reversal of 15312889 is 98821351.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 13017664 + 2295225 = 3608^2 + 1515^2 .

It is an emirp because it is prime and its reverse (98821351) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 15312889 - 2¹ = 15312887 is a prime.

Together with 15312887, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (15312883) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7656444 + 7656445.

It is an arithmetic number, because the mean of its divisors is an integer number (7656445).

Almost surely, 2^15312889 is an apocalyptic number.

It is an amenable number.

15312889 is a deficient number, since it is larger than the sum of its proper divisors (1).

15312889 is an equidigital number, since it uses as much as digits as its factorization.

15312889 is an evil number, because the sum of its binary digits is even.

The product of its digits is 17280, while the sum is 37.

The square root of 15312889 is about 3913.1686649057. The cubic root of 15312889 is about 248.3241998753.

The spelling of 15312889 in words is "fifteen million, three hundred twelve thousand, eight hundred eighty-nine".