51115930 has 16 divisors (see below), whose sum is σ = 94253544. Its totient is φ = 19947520.

The previous prime is 51115927. The next prime is 51115943. The reversal of 51115930 is 3951115.

It can be written as a sum of positive squares in 4 ways, for example, as 44235801 + 6880129 = 6651^2 + 2623^2 .

It is a super-2 number, since 2×51115930² = 5225676599529800, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 51115895 and 51115904.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 61927 + ... + 62746.

Almost surely, 2^51115930 is an apocalyptic number.

51115930 is a deficient number, since it is larger than the sum of its proper divisors (43137614).

51115930 is a wasteful number, since it uses less digits than its factorization.

51115930 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 124721.

The product of its (nonzero) digits is 675, while the sum is 25.

The square root of 51115930 is about 7149.5405446784. The cubic root of 51115930 is about 371.1237566126.

The spelling of 51115930 in words is "fifty-one million, one hundred fifteen thousand, nine hundred thirty".