515087813 has 2 divisors, whose sum is σ = 515087814. Its totient is φ = 515087812.

The previous prime is 515087789. The next prime is 515087827. The reversal of 515087813 is 318780515.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 389154529 + 125933284 = 19727^2 + 11222^2 .

It is a cyclic number.

It is not a de Polignac number, because 515087813 - 2¹⁸ = 514825669 is a prime.

It is a super-2 number, since 2×515087813² = 530630910202245938, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (515087863) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 257543906 + 257543907.

It is an arithmetic number, because the mean of its divisors is an integer number (257543907).

Almost surely, 2^515087813 is an apocalyptic number.

It is an amenable number.

515087813 is a deficient number, since it is larger than the sum of its proper divisors (1).

515087813 is an equidigital number, since it uses as much as digits as its factorization.

515087813 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 33600, while the sum is 38.

The square root of 515087813 is about 22695.5461049079. The cubic root of 515087813 is about 801.6050136978.

The spelling of 515087813 in words is "five hundred fifteen million, eighty-seven thousand, eight hundred thirteen".