16561147 has 2 divisors, whose sum is σ = 16561148. Its totient is φ = 16561146.

The previous prime is 16561093. The next prime is 16561157. The reversal of 16561147 is 74116561.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 16561147 - 2²³ = 8172539 is a prime.

It is not a weakly prime, because it can be changed into another prime (16561157) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8280573 + 8280574.

It is an arithmetic number, because the mean of its divisors is an integer number (8280574).

Almost surely, 2^16561147 is an apocalyptic number.

16561147 is a deficient number, since it is larger than the sum of its proper divisors (1).

16561147 is an equidigital number, since it uses as much as digits as its factorization.

16561147 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5040, while the sum is 31.

The square root of 16561147 is about 4069.5389173714. The cubic root of 16561147 is about 254.8962643542.

The spelling of 16561147 in words is "sixteen million, five hundred sixty-one thousand, one hundred forty-seven".