15961641 has 8 divisors (see below), whose sum is σ = 21501984. Its totient is φ = 10531200.

The previous prime is 15961637. The next prime is 15961651. The reversal of 15961641 is 14616951.

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

It is not a de Polignac number, because 15961641 - 2² = 15961637 is a prime.

It is not an unprimeable number, because it can be changed into a prime (15961651) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 27135 + ... + 27716.

It is an arithmetic number, because the mean of its divisors is an integer number (2687748).

Almost surely, 2^15961641 is an apocalyptic number.

It is an amenable number.

15961641 is a deficient number, since it is larger than the sum of its proper divisors (5540343).

15961641 is an equidigital number, since it uses as much as digits as its factorization.

15961641 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 54951.

The product of its digits is 6480, while the sum is 33.

The square root of 15961641 is about 3995.2022476966. The cubic root of 15961641 is about 251.7826767071.

The spelling of 15961641 in words is "fifteen million, nine hundred sixty-one thousand, six hundred forty-one".