15613421 has 4 divisors (see below), whose sum is σ = 16435200. Its totient is φ = 14791644.

The previous prime is 15613399. The next prime is 15613427. The reversal of 15613421 is 12431651.

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 a cyclic number.

It is not a de Polignac number, because 15613421 - 2⁶ = 15613357 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (15613427) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 410861 + ... + 410898.

It is an arithmetic number, because the mean of its divisors is an integer number (4108800).

Almost surely, 2^15613421 is an apocalyptic number.

It is an amenable number.

15613421 is a deficient number, since it is larger than the sum of its proper divisors (821779).

15613421 is an equidigital number, since it uses as much as digits as its factorization.

15613421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 821778.

The product of its digits is 720, while the sum is 23.

The square root of 15613421 is about 3951.3821632436. The cubic root of 15613421 is about 249.9382300725.

The spelling of 15613421 in words is "fifteen million, six hundred thirteen thousand, four hundred twenty-one".