515661025 has 12 divisors (see below), whose sum is σ = 697549104. Its totient is φ = 375026000.

The previous prime is 515660987. The next prime is 515661043. The reversal of 515661025 is 520166515.

It is not a de Polignac number, because 515661025 - 2¹⁷ = 515529953 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 937291 + ... + 937840.

It is an arithmetic number, because the mean of its divisors is an integer number (58129092).

Almost surely, 2^515661025 is an apocalyptic number.

515661025 is a gapful number since it is divisible by the number (55) formed by its first and last digit.

It is an amenable number.

515661025 is a deficient number, since it is larger than the sum of its proper divisors (181888079).

515661025 is a wasteful number, since it uses less digits than its factorization.

515661025 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1875152 (or 1875147 counting only the distinct ones).

The product of its (nonzero) digits is 9000, while the sum is 31.

The square root of 515661025 is about 22708.1708862691. The cubic root of 515661025 is about 801.9022570417.

The spelling of 515661025 in words is "five hundred fifteen million, six hundred sixty-one thousand, twenty-five".