515400397 has 2 divisors, whose sum is σ = 515400398. Its totient is φ = 515400396.

The previous prime is 515400377. The next prime is 515400443. The reversal of 515400397 is 793004515.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 342583081 + 172817316 = 18509^2 + 13146^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-515400397 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (515400317) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 257700198 + 257700199.

It is an arithmetic number, because the mean of its divisors is an integer number (257700199).

Almost surely, 2^515400397 is an apocalyptic number.

It is an amenable number.

515400397 is a deficient number, since it is larger than the sum of its proper divisors (1).

515400397 is an equidigital number, since it uses as much as digits as its factorization.

515400397 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 18900, while the sum is 34.

The square root of 515400397 is about 22702.4315217555. The cubic root of 515400397 is about 801.7671337778.

The spelling of 515400397 in words is "five hundred fifteen million, four hundred thousand, three hundred ninety-seven".