16191251 has 4 divisors (see below), whose sum is σ = 16749600. Its totient is φ = 15632904.

The previous prime is 16191247. The next prime is 16191271. The reversal of 16191251 is 15219161.

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 16191251 - 2² = 16191247 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 16191251.

It is not an unprimeable number, because it can be changed into a prime (16191271) 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, 279131 + ... + 279188.

It is an arithmetic number, because the mean of its divisors is an integer number (4187400).

Almost surely, 2^16191251 is an apocalyptic number.

16191251 is a deficient number, since it is larger than the sum of its proper divisors (558349).

16191251 is an equidigital number, since it uses as much as digits as its factorization.

16191251 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 558348.

The product of its digits is 540, while the sum is 26.

The square root of 16191251 is about 4023.8353594550. The cubic root of 16191251 is about 252.9842408177.

The spelling of 16191251 in words is "sixteen million, one hundred ninety-one thousand, two hundred fifty-one".