15648973 has 2 divisors, whose sum is σ = 15648974. Its totient is φ = 15648972.

The previous prime is 15648967. The next prime is 15648977. The reversal of 15648973 is 37984651.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 13638249 + 2010724 = 3693^2 + 1418^2 .

It is a cyclic number.

It is not a de Polignac number, because 15648973 - 2⁹ = 15648461 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (15648977) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7824486 + 7824487.

It is an arithmetic number, because the mean of its divisors is an integer number (7824487).

Almost surely, 2^15648973 is an apocalyptic number.

It is an amenable number.

15648973 is a deficient number, since it is larger than the sum of its proper divisors (1).

15648973 is an equidigital number, since it uses as much as digits as its factorization.

15648973 is an evil number, because the sum of its binary digits is even.

The product of its digits is 181440, while the sum is 43.

The square root of 15648973 is about 3955.8782842752. The cubic root of 15648973 is about 250.1277906671.

The spelling of 15648973 in words is "fifteen million, six hundred forty-eight thousand, nine hundred seventy-three".