16148721 has 4 divisors (see below), whose sum is σ = 21531632. Its totient is φ = 10765812.

The previous prime is 16148719. The next prime is 16148731. The reversal of 16148721 is 12784161.

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 16148721 - 2¹ = 16148719 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16148731) 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, 2691451 + ... + 2691456.

It is an arithmetic number, because the mean of its divisors is an integer number (5382908).

Almost surely, 2^16148721 is an apocalyptic number.

It is an amenable number.

16148721 is a deficient number, since it is larger than the sum of its proper divisors (5382911).

16148721 is an equidigital number, since it uses as much as digits as its factorization.

16148721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5382910.

The product of its digits is 2688, while the sum is 30.

The square root of 16148721 is about 4018.5471255169. The cubic root of 16148721 is about 252.7625397229.

The spelling of 16148721 in words is "sixteen million, one hundred forty-eight thousand, seven hundred twenty-one".