15641641 has 4 divisors (see below), whose sum is σ = 15715984. Its totient is φ = 15567300.

The previous prime is 15641629. The next prime is 15641651. The reversal of 15641641 is 14614651.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 14614651 = 317 ⋅46103.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-15641641 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (15641621) 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 3 ways as a sum of consecutive naturals, for example, 36855 + ... + 37276.

It is an arithmetic number, because the mean of its divisors is an integer number (3928996).

Almost surely, 2^15641641 is an apocalyptic number.

It is an amenable number.

15641641 is a deficient number, since it is larger than the sum of its proper divisors (74343).

15641641 is an equidigital number, since it uses as much as digits as its factorization.

15641641 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 74342.

The product of its digits is 2880, while the sum is 28.

The square root of 15641641 is about 3954.9514535579. The cubic root of 15641641 is about 250.0887205110.

The spelling of 15641641 in words is "fifteen million, six hundred forty-one thousand, six hundred forty-one".