15997733 has 2 divisors, whose sum is σ = 15997734. Its totient is φ = 15997732.

The previous prime is 15997717. The next prime is 15997739. The reversal of 15997733 is 33779951.

15997733 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., 12376324 + 3621409 = 3518^2 + 1903^2 .

It is an emirp because it is prime and its reverse (33779951) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 15997733 - 2⁴ = 15997717 is a prime.

It is a super-2 number, since 2×15997733² = 511854922278578, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (15997739) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7998866 + 7998867.

It is an arithmetic number, because the mean of its divisors is an integer number (7998867).

Almost surely, 2^15997733 is an apocalyptic number.

It is an amenable number.

15997733 is a deficient number, since it is larger than the sum of its proper divisors (1).

15997733 is an equidigital number, since it uses as much as digits as its factorization.

15997733 is an evil number, because the sum of its binary digits is even.

The product of its digits is 178605, while the sum is 44.

The square root of 15997733 is about 3999.7166149616. The cubic root of 15997733 is about 251.9723084126.

The spelling of 15997733 in words is "fifteen million, nine hundred ninety-seven thousand, seven hundred thirty-three".