515440402949 has 4 divisors (see below), whose sum is σ = 515837813964. Its totient is φ = 515042991936.

The previous prime is 515440402927. The next prime is 515440402987. The reversal of 515440402949 is 949204044515.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 358926801025 + 156513601924 = 599105^2 + 395618^2 .

It is a cyclic number.

It is not a de Polignac number, because 515440402949 - 2²⁰ = 515439354373 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (515440402909) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 198703562 + ... + 198706155.

It is an arithmetic number, because the mean of its divisors is an integer number (128959453491).

Almost surely, 2^515440402949 is an apocalyptic number.

It is an amenable number.

515440402949 is a deficient number, since it is larger than the sum of its proper divisors (397411015).

515440402949 is a wasteful number, since it uses less digits than its factorization.

515440402949 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 397411014.

The product of its (nonzero) digits is 1036800, while the sum is 47.

The spelling of 515440402949 in words is "five hundred fifteen billion, four hundred forty million, four hundred two thousand, nine hundred forty-nine".