15997451 has 2 divisors, whose sum is σ = 15997452. Its totient is φ = 15997450.

The previous prime is 15997403. The next prime is 15997469. The reversal of 15997451 is 15479951.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 15997451 - 2¹⁰ = 15996427 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 15997399 and 15997408.

It is not a weakly prime, because it can be changed into another prime (15997481) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7998725 + 7998726.

It is an arithmetic number, because the mean of its divisors is an integer number (7998726).

Almost surely, 2^15997451 is an apocalyptic number.

15997451 is a deficient number, since it is larger than the sum of its proper divisors (1).

15997451 is an equidigital number, since it uses as much as digits as its factorization.

15997451 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 56700, while the sum is 41.

The square root of 15997451 is about 3999.6813623088. The cubic root of 15997451 is about 251.9708278568.

The spelling of 15997451 in words is "fifteen million, nine hundred ninety-seven thousand, four hundred fifty-one".