15729997 has 2 divisors, whose sum is σ = 15729998. Its totient is φ = 15729996.

The previous prime is 15729991. The next prime is 15730003. The reversal of 15729997 is 79992751.

It is a balanced prime because it is at equal distance from previous prime (15729991) and next prime (15730003).

It can be written as a sum of positive squares in only one way, i.e., 15729156 + 841 = 3966^2 + 29^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-15729997 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 15729997.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (15729991) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7864998 + 7864999.

It is an arithmetic number, because the mean of its divisors is an integer number (7864999).

Almost surely, 2^15729997 is an apocalyptic number.

It is an amenable number.

15729997 is a deficient number, since it is larger than the sum of its proper divisors (1).

15729997 is an equidigital number, since it uses as much as digits as its factorization.

15729997 is an evil number, because the sum of its binary digits is even.

The product of its digits is 357210, while the sum is 49.

The square root of 15729997 is about 3966.1060248057. The cubic root of 15729997 is about 250.5587343335.

The spelling of 15729997 in words is "fifteen million, seven hundred twenty-nine thousand, nine hundred ninety-seven".