15998197 has 2 divisors, whose sum is σ = 15998198. Its totient is φ = 15998196.

The previous prime is 15998161. The next prime is 15998221. The reversal of 15998197 is 79189951.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 13205956 + 2792241 = 3634^2 + 1671^2 .

It is a cyclic number.

It is not a de Polignac number, because 15998197 - 2⁷ = 15998069 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 15998197.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (15998137) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7999098 + 7999099.

It is an arithmetic number, because the mean of its divisors is an integer number (7999099).

Almost surely, 2^15998197 is an apocalyptic number.

It is an amenable number.

15998197 is a deficient number, since it is larger than the sum of its proper divisors (1).

15998197 is an equidigital number, since it uses as much as digits as its factorization.

15998197 is an evil number, because the sum of its binary digits is even.

The product of its digits is 204120, while the sum is 49.

The square root of 15998197 is about 3999.7746186504. The cubic root of 15998197 is about 251.9747444665.

The spelling of 15998197 in words is "fifteen million, nine hundred ninety-eight thousand, one hundred ninety-seven".