15489121 has 2 divisors, whose sum is σ = 15489122. Its totient is φ = 15489120.

The previous prime is 15489113. The next prime is 15489151. The reversal of 15489121 is 12198451.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 15171025 + 318096 = 3895^2 + 564^2 .

It is a cyclic number.

It is not a de Polignac number, because 15489121 - 2³ = 15489113 is a prime.

It is not a weakly prime, because it can be changed into another prime (15489151) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7744560 + 7744561.

It is an arithmetic number, because the mean of its divisors is an integer number (7744561).

Almost surely, 2^15489121 is an apocalyptic number.

It is an amenable number.

15489121 is a deficient number, since it is larger than the sum of its proper divisors (1).

15489121 is an equidigital number, since it uses as much as digits as its factorization.

15489121 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2880, while the sum is 31.

The square root of 15489121 is about 3935.6220601069. The cubic root of 15489121 is about 249.2732011010.

The spelling of 15489121 in words is "fifteen million, four hundred eighty-nine thousand, one hundred twenty-one".