15220313897 has 2 divisors, whose sum is σ = 15220313898. Its totient is φ = 15220313896.

The previous prime is 15220313881. The next prime is 15220313903. The reversal of 15220313897 is 79831302251.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 15213002281 + 7311616 = 123341^2 + 2704^2 .

It is a cyclic number.

It is not a de Polignac number, because 15220313897 - 2⁴ = 15220313881 is a prime.

It is a super-2 number, since 2×15220313897² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (15220313597) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7610156948 + 7610156949.

It is an arithmetic number, because the mean of its divisors is an integer number (7610156949).

Almost surely, 2^15220313897 is an apocalyptic number.

It is an amenable number.

15220313897 is a deficient number, since it is larger than the sum of its proper divisors (1).

15220313897 is an equidigital number, since it uses as much as digits as its factorization.

15220313897 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 90720, while the sum is 41.

The spelling of 15220313897 in words is "fifteen billion, two hundred twenty million, three hundred thirteen thousand, eight hundred ninety-seven".