16261997 has 2 divisors, whose sum is σ = 16261998. Its totient is φ = 16261996.

The previous prime is 16261961. The next prime is 16262003. The reversal of 16261997 is 79916261.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 10569001 + 5692996 = 3251^2 + 2386^2 .

It is a cyclic number.

It is not a de Polignac number, because 16261997 - 2⁶ = 16261933 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 (16260997) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8130998 + 8130999.

It is an arithmetic number, because the mean of its divisors is an integer number (8130999).

Almost surely, 2^16261997 is an apocalyptic number.

It is an amenable number.

16261997 is a deficient number, since it is larger than the sum of its proper divisors (1).

16261997 is an equidigital number, since it uses as much as digits as its factorization.

16261997 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 40824, while the sum is 41.

The square root of 16261997 is about 4032.6166443142. The cubic root of 16261997 is about 253.3521683057.

The spelling of 16261997 in words is "sixteen million, two hundred sixty-one thousand, nine hundred ninety-seven".