51115005 has 48 divisors (see below), whose sum is σ = 94826160. Its totient is φ = 25380864.

The previous prime is 51114983. The next prime is 51115049. The reversal of 51115005 is 50051115.

51115005 is a `hidden beast` number, since 511 + 150 + 0 + 5 = 666.

It can be written as a sum of positive squares in 8 ways, for example, as 1750329 + 49364676 = 1323^2 + 7026^2 .

It is not a de Polignac number, because 51115005 - 2⁹ = 51114493 is a prime.

It is a super-2 number, since 2×51115005² = 5225487472300050, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 83079 + ... + 83691.

It is an arithmetic number, because the mean of its divisors is an integer number (1975545).

Almost surely, 2^51115005 is an apocalyptic number.

It is an amenable number.

51115005 is a deficient number, since it is larger than the sum of its proper divisors (43711155).

51115005 is a wasteful number, since it uses less digits than its factorization.

51115005 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 750 (or 747 counting only the distinct ones).

The product of its (nonzero) digits is 125, while the sum is 18.

The square root of 51115005 is about 7149.4758549141. The cubic root of 51115005 is about 371.1215179657.

The spelling of 51115005 in words is "fifty-one million, one hundred fifteen thousand, five".