515215397 has 2 divisors, whose sum is σ = 515215398. Its totient is φ = 515215396.

The previous prime is 515215357. The next prime is 515215427. The reversal of 515215397 is 793512515.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 379119841 + 136095556 = 19471^2 + 11666^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-515215397 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 515215397.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (515215357) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 257607698 + 257607699.

It is an arithmetic number, because the mean of its divisors is an integer number (257607699).

Almost surely, 2^515215397 is an apocalyptic number.

It is an amenable number.

515215397 is a deficient number, since it is larger than the sum of its proper divisors (1).

515215397 is an equidigital number, since it uses as much as digits as its factorization.

515215397 is an evil number, because the sum of its binary digits is even.

The product of its digits is 47250, while the sum is 38.

The square root of 515215397 is about 22698.3567026338. The cubic root of 515215397 is about 801.6711924015.

The spelling of 515215397 in words is "five hundred fifteen million, two hundred fifteen thousand, three hundred ninety-seven".