15514721 has 4 divisors (see below), whose sum is σ = 15746352. Its totient is φ = 15283092.

The previous prime is 15514661. The next prime is 15514753. The reversal of 15514721 is 12741551.

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 15514721 - 2¹⁴ = 15498337 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (15514781) 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, 115715 + ... + 115848.

It is an arithmetic number, because the mean of its divisors is an integer number (3936588).

Almost surely, 2^15514721 is an apocalyptic number.

It is an amenable number.

15514721 is a deficient number, since it is larger than the sum of its proper divisors (231631).

15514721 is an equidigital number, since it uses as much as digits as its factorization.

15514721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 231630.

The product of its digits is 1400, while the sum is 26.

The square root of 15514721 is about 3938.8730621842. The cubic root of 15514721 is about 249.4104561785.

The spelling of 15514721 in words is "fifteen million, five hundred fourteen thousand, seven hundred twenty-one".