215915309101397 has 2 divisors, whose sum is σ = 215915309101398. Its totient is φ = 215915309101396.

The previous prime is 215915309101369. The next prime is 215915309101441. The reversal of 215915309101397 is 793101903519512.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 177395734362001 + 38519574739396 = 13318999^2 + 6206414^2 .

It is a cyclic number.

It is not a de Polignac number, because 215915309101397 - 2⁶ = 215915309101333 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (215915309103397) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 107957654550698 + 107957654550699.

It is an arithmetic number, because the mean of its divisors is an integer number (107957654550699).

Almost surely, 2^{215915309101397} is an apocalyptic number.

It is an amenable number.

215915309101397 is a deficient number, since it is larger than the sum of its proper divisors (1).

215915309101397 is an equidigital number, since it uses as much as digits as its factorization.

215915309101397 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2296350, while the sum is 56.

The spelling of 215915309101397 in words is "two hundred fifteen trillion, nine hundred fifteen billion, three hundred nine million, one hundred one thousand, three hundred ninety-seven".