16500397 has 2 divisors, whose sum is σ = 16500398. Its totient is φ = 16500396.

The previous prime is 16500313. The next prime is 16500413. The reversal of 16500397 is 79300561.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 10982596 + 5517801 = 3314^2 + 2349^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-16500397 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16500307) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8250198 + 8250199.

It is an arithmetic number, because the mean of its divisors is an integer number (8250199).

Almost surely, 2^16500397 is an apocalyptic number.

It is an amenable number.

16500397 is a deficient number, since it is larger than the sum of its proper divisors (1).

16500397 is an equidigital number, since it uses as much as digits as its factorization.

16500397 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5670, while the sum is 31.

The square root of 16500397 is about 4062.0680693460. The cubic root of 16500397 is about 254.5842102670.

The spelling of 16500397 in words is "sixteen million, five hundred thousand, three hundred ninety-seven".