16253691 has 4 divisors (see below), whose sum is σ = 21671592. Its totient is φ = 10835792.

The previous prime is 16253689. The next prime is 16253701. The reversal of 16253691 is 19635261.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 16253691 - 2¹ = 16253689 is a prime.

It is a super-2 number, since 2×16253691² = 528364942246962, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (16253651) 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, 2708946 + ... + 2708951.

It is an arithmetic number, because the mean of its divisors is an integer number (5417898).

Almost surely, 2^16253691 is an apocalyptic number.

16253691 is a deficient number, since it is larger than the sum of its proper divisors (5417901).

16253691 is an equidigital number, since it uses as much as digits as its factorization.

16253691 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5417900.

The product of its digits is 9720, while the sum is 33.

The square root of 16253691 is about 4031.5866603609. The cubic root of 16253691 is about 253.3090267923.

The spelling of 16253691 in words is "sixteen million, two hundred fifty-three thousand, six hundred ninety-one".