16391797 has 2 divisors, whose sum is σ = 16391798. Its totient is φ = 16391796.

The previous prime is 16391761. The next prime is 16391803. The reversal of 16391797 is 79719361.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 10588516 + 5803281 = 3254^2 + 2409^2 .

It is a cyclic number.

It is not a de Polignac number, because 16391797 - 2¹¹ = 16389749 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16391707) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8195898 + 8195899.

It is an arithmetic number, because the mean of its divisors is an integer number (8195899).

Almost surely, 2^16391797 is an apocalyptic number.

It is an amenable number.

16391797 is a deficient number, since it is larger than the sum of its proper divisors (1).

16391797 is an equidigital number, since it uses as much as digits as its factorization.

16391797 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 71442, while the sum is 43.

The square root of 16391797 is about 4048.6784263510. The cubic root of 16391797 is about 254.0244515283.

The spelling of 16391797 in words is "sixteen million, three hundred ninety-one thousand, seven hundred ninety-seven".