15997469 has 2 divisors, whose sum is σ = 15997470. Its totient is φ = 15997468.

The previous prime is 15997451. The next prime is 15997477. The reversal of 15997469 is 96479951.

15997469 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 11323225 + 4674244 = 3365^2 + 2162^2 .

It is an emirp because it is prime and its reverse (96479951) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-15997469 is a prime.

It is a super-2 number, since 2×15997469² = 511838028811922, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (15997169) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7998734 + 7998735.

It is an arithmetic number, because the mean of its divisors is an integer number (7998735).

Almost surely, 2^15997469 is an apocalyptic number.

It is an amenable number.

15997469 is a deficient number, since it is larger than the sum of its proper divisors (1).

15997469 is an equidigital number, since it uses as much as digits as its factorization.

15997469 is an evil number, because the sum of its binary digits is even.

The product of its digits is 612360, while the sum is 50.

The square root of 15997469 is about 3999.6836124874. The cubic root of 15997469 is about 251.9709223609.

The spelling of 15997469 in words is "fifteen million, nine hundred ninety-seven thousand, four hundred sixty-nine".