16436561 has 4 divisors (see below), whose sum is σ = 16470000. Its totient is φ = 16403124.

The previous prime is 16436551. The next prime is 16436579. The reversal of 16436561 is 16563461.

16436561 is nontrivially palindromic in base 11.

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 a cyclic number.

It is not a de Polignac number, because 16436561 - 2²² = 12242257 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16436521) 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, 15971 + ... + 16968.

It is an arithmetic number, because the mean of its divisors is an integer number (4117500).

Almost surely, 2^16436561 is an apocalyptic number.

It is an amenable number.

16436561 is a deficient number, since it is larger than the sum of its proper divisors (33439).

16436561 is an equidigital number, since it uses as much as digits as its factorization.

16436561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33438.

The product of its digits is 12960, while the sum is 32.

The square root of 16436561 is about 4054.2028809619. The cubic root of 16436561 is about 254.2554779608.

The spelling of 16436561 in words is "sixteen million, four hundred thirty-six thousand, five hundred sixty-one".