16561151 has 4 divisors (see below), whose sum is σ = 16687704. Its totient is φ = 16434600.

The previous prime is 16561147. The next prime is 16561157. The reversal of 16561151 is 15116561.

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 16561151 - 2² = 16561147 is a prime.

It is a Duffinian number.

It is a plaindrome in base 12.

It is a self number, because there is not a number n which added to its sum of digits gives 16561151.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16561157) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 63080 + ... + 63341.

It is an arithmetic number, because the mean of its divisors is an integer number (4171926).

Almost surely, 2^16561151 is an apocalyptic number.

16561151 is a deficient number, since it is larger than the sum of its proper divisors (126553).

16561151 is a wasteful number, since it uses less digits than its factorization.

16561151 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 126552.

The product of its digits is 900, while the sum is 26.

The square root of 16561151 is about 4069.5394088275. The cubic root of 16561151 is about 254.8962848758.

It can be divided in two parts, 165 and 61151, that added together give a palindrome (61316).

The spelling of 16561151 in words is "sixteen million, five hundred sixty-one thousand, one hundred fifty-one".