15634961 has 4 divisors (see below), whose sum is σ = 15721524. Its totient is φ = 15548400.

The previous prime is 15634939. The next prime is 15634991. The reversal of 15634961 is 16943651.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 2356225 + 13278736 = 1535^2 + 3644^2 .

It is a cyclic number.

It is not a de Polignac number, because 15634961 - 2²² = 11440657 is a prime.

It is a Duffinian number.

It is a nialpdrome in base 16.

It is not an unprimeable number, because it can be changed into a prime (15634991) 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 in 3 ways as a sum of consecutive naturals, for example, 43010 + ... + 43371.

It is an arithmetic number, because the mean of its divisors is an integer number (3930381).

Almost surely, 2^15634961 is an apocalyptic number.

It is an amenable number.

15634961 is a deficient number, since it is larger than the sum of its proper divisors (86563).

15634961 is an equidigital number, since it uses as much as digits as its factorization.

15634961 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 86562.

The product of its digits is 19440, while the sum is 35.

The square root of 15634961 is about 3954.1068523751. The cubic root of 15634961 is about 250.0531140481.

The spelling of 15634961 in words is "fifteen million, six hundred thirty-four thousand, nine hundred sixty-one".