16780997 has 2 divisors, whose sum is σ = 16780998. Its totient is φ = 16780996.

The previous prime is 16780991. The next prime is 16781033. The reversal of 16780997 is 79908761.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16370116 + 410881 = 4046^2 + 641^2 .

It is a cyclic number.

It is not a de Polignac number, because 16780997 - 2¹² = 16776901 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16780991) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8390498 + 8390499.

It is an arithmetic number, because the mean of its divisors is an integer number (8390499).

Almost surely, 2^16780997 is an apocalyptic number.

It is an amenable number.

16780997 is a deficient number, since it is larger than the sum of its proper divisors (1).

16780997 is an equidigital number, since it uses as much as digits as its factorization.

16780997 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 190512, while the sum is 47.

The square root of 16780997 is about 4096.4615218503. The cubic root of 16780997 is about 256.0192297160.

The spelling of 16780997 in words is "sixteen million, seven hundred eighty thousand, nine hundred ninety-seven".