15121889 has 2 divisors, whose sum is σ = 15121890. Its totient is φ = 15121888.

The previous prime is 15121829. The next prime is 15121903. The reversal of 15121889 is 98812151.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 14326225 + 795664 = 3785^2 + 892^2 .

It is a cyclic number.

It is not a de Polignac number, because 15121889 - 2⁸ = 15121633 is a prime.

It is not a weakly prime, because it can be changed into another prime (15121819) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7560944 + 7560945.

It is an arithmetic number, because the mean of its divisors is an integer number (7560945).

Almost surely, 2^15121889 is an apocalyptic number.

It is an amenable number.

15121889 is a deficient number, since it is larger than the sum of its proper divisors (1).

15121889 is an equidigital number, since it uses as much as digits as its factorization.

15121889 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5760, while the sum is 35.

The square root of 15121889 is about 3888.6873106487. The cubic root of 15121889 is about 247.2874153215.

The spelling of 15121889 in words is "fifteen million, one hundred twenty-one thousand, eight hundred eighty-nine".