15220897 has 2 divisors, whose sum is σ = 15220898. Its totient is φ = 15220896.

The previous prime is 15220889. The next prime is 15220921. The reversal of 15220897 is 79802251.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 8059921 + 7160976 = 2839^2 + 2676^2 .

It is an emirp because it is prime and its reverse (79802251) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 15220897 - 2³ = 15220889 is a prime.

It is not a weakly prime, because it can be changed into another prime (15220867) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7610448 + 7610449.

It is an arithmetic number, because the mean of its divisors is an integer number (7610449).

Almost surely, 2^15220897 is an apocalyptic number.

It is an amenable number.

15220897 is a deficient number, since it is larger than the sum of its proper divisors (1).

15220897 is an equidigital number, since it uses as much as digits as its factorization.

15220897 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 10080, while the sum is 34.

The square root of 15220897 is about 3901.3968011470. The cubic root of 15220897 is about 247.8259325272.

The spelling of 15220897 in words is "fifteen million, two hundred twenty thousand, eight hundred ninety-seven".