15209961 has 8 divisors (see below), whose sum is σ = 21840000. Its totient is φ = 9359952.

The previous prime is 15209947. The next prime is 15209963. The reversal of 15209961 is 16990251.

15209961 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is not a de Polignac number, because 15209961 - 2⁶ = 15209897 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (15209963) 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, 194961 + ... + 195038.

It is an arithmetic number, because the mean of its divisors is an integer number (2730000).

Almost surely, 2^15209961 is an apocalyptic number.

It is an amenable number.

15209961 is a deficient number, since it is larger than the sum of its proper divisors (6630039).

15209961 is a wasteful number, since it uses less digits than its factorization.

15209961 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 390015.

The product of its (nonzero) digits is 4860, while the sum is 33.

The square root of 15209961 is about 3899.9949999968. The cubic root of 15209961 is about 247.7665651600.

The spelling of 15209961 in words is "fifteen million, two hundred nine thousand, nine hundred sixty-one".