15320971 has 2 divisors, whose sum is σ = 15320972. Its totient is φ = 15320970.

The previous prime is 15320953. The next prime is 15320983. The reversal of 15320971 is 17902351.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 15320971 - 2⁵ = 15320939 is a prime.

It is not a weakly prime, because it can be changed into another prime (15320951) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7660485 + 7660486.

It is an arithmetic number, because the mean of its divisors is an integer number (7660486).

Almost surely, 2^15320971 is an apocalyptic number.

15320971 is a deficient number, since it is larger than the sum of its proper divisors (1).

15320971 is an equidigital number, since it uses as much as digits as its factorization.

15320971 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1890, while the sum is 28.

The square root of 15320971 is about 3914.2011956464. The cubic root of 15320971 is about 248.3678799238.

The spelling of 15320971 in words is "fifteen million, three hundred twenty thousand, nine hundred seventy-one".