15941649 has 4 divisors (see below), whose sum is σ = 21255536. Its totient is φ = 10627764.

The previous prime is 15941633. The next prime is 15941669. The reversal of 15941649 is 94614951.

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.

It is not a de Polignac number, because 15941649 - 2⁴ = 15941633 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (15941669) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2656939 + ... + 2656944.

It is an arithmetic number, because the mean of its divisors is an integer number (5313884).

Almost surely, 2^15941649 is an apocalyptic number.

It is an amenable number.

15941649 is a deficient number, since it is larger than the sum of its proper divisors (5313887).

15941649 is an equidigital number, since it uses as much as digits as its factorization.

15941649 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5313886.

The product of its digits is 38880, while the sum is 39.

The square root of 15941649 is about 3992.6994627695. The cubic root of 15941649 is about 251.6775132868.

The spelling of 15941649 in words is "fifteen million, nine hundred forty-one thousand, six hundred forty-nine".