14991997 has 2 divisors, whose sum is σ = 14991998. Its totient is φ = 14991996.

The previous prime is 14991973. The next prime is 14992009. The reversal of 14991997 is 79919941.

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., 10023556 + 4968441 = 3166^2 + 2229^2 .

It is a cyclic number.

It is not a de Polignac number, because 14991997 - 2¹⁵ = 14959229 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 14991997.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (14991917) 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, 7495998 + 7495999.

It is an arithmetic number, because the mean of its divisors is an integer number (7495999).

Almost surely, 2^14991997 is an apocalyptic number.

It is an amenable number.

14991997 is a deficient number, since it is larger than the sum of its proper divisors (1).

14991997 is an equidigital number, since it uses as much as digits as its factorization.

14991997 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 183708, while the sum is 49.

The square root of 14991997 is about 3871.9500255039. The cubic root of 14991997 is about 246.5773394188.

The spelling of 14991997 in words is "fourteen million, nine hundred ninety-one thousand, nine hundred ninety-seven".