16536391 has 2 divisors, whose sum is σ = 16536392. Its totient is φ = 16536390.

The previous prime is 16536383. The next prime is 16536437. The reversal of 16536391 is 19363561.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 16536391 - 2³ = 16536383 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16536491) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8268195 + 8268196.

It is an arithmetic number, because the mean of its divisors is an integer number (8268196).

Almost surely, 2^16536391 is an apocalyptic number.

16536391 is a deficient number, since it is larger than the sum of its proper divisors (1).

16536391 is an equidigital number, since it uses as much as digits as its factorization.

16536391 is an evil number, because the sum of its binary digits is even.

The product of its digits is 14580, while the sum is 34.

The square root of 16536391 is about 4066.4961576276. The cubic root of 16536391 is about 254.7691926654.

The spelling of 16536391 in words is "sixteen million, five hundred thirty-six thousand, three hundred ninety-one".