16993237 has 2 divisors, whose sum is σ = 16993238. Its totient is φ = 16993236.

The previous prime is 16993199. The next prime is 16993241. The reversal of 16993237 is 73239961.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 9991921 + 7001316 = 3161^2 + 2646^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-16993237 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 16993237.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16993247) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8496618 + 8496619.

It is an arithmetic number, because the mean of its divisors is an integer number (8496619).

Almost surely, 2^16993237 is an apocalyptic number.

It is an amenable number.

16993237 is a deficient number, since it is larger than the sum of its proper divisors (1).

16993237 is an equidigital number, since it uses as much as digits as its factorization.

16993237 is an evil number, because the sum of its binary digits is even.

The product of its digits is 61236, while the sum is 40.

The square root of 16993237 is about 4122.2854098182. The cubic root of 16993237 is about 257.0940573327.

The spelling of 16993237 in words is "sixteen million, nine hundred ninety-three thousand, two hundred thirty-seven".