15121649 has 8 divisors (see below), whose sum is σ = 15897600. Its totient is φ = 14355616.

The previous prime is 15121633. The next prime is 15121657. The reversal of 15121649 is 94612151.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 15121649 - 2⁴ = 15121633 is a prime.

It is not an unprimeable number, because it can be changed into a prime (15121609) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 752 + ... + 5550.

It is an arithmetic number, because the mean of its divisors is an integer number (1987200).

Almost surely, 2^15121649 is an apocalyptic number.

It is an amenable number.

15121649 is a deficient number, since it is larger than the sum of its proper divisors (775951).

15121649 is a wasteful number, since it uses less digits than its factorization.

15121649 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4959.

The product of its digits is 2160, while the sum is 29.

The square root of 15121649 is about 3888.6564517838. The cubic root of 15121649 is about 247.2861070790.

The spelling of 15121649 in words is "fifteen million, one hundred twenty-one thousand, six hundred forty-nine".