51561146 has 16 divisors (see below), whose sum is σ = 95190144. Its totient is φ = 20397744.

The previous prime is 51561137. The next prime is 51561151. The reversal of 51561146 is 64116515.

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, 141470 + ... + 141833.

It is an arithmetic number, because the mean of its divisors is an integer number (5949384).

Almost surely, 2^51561146 is an apocalyptic number.

51561146 is a deficient number, since it is larger than the sum of its proper divisors (43628998).

51561146 is a wasteful number, since it uses less digits than its factorization.

51561146 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 283325.

The product of its digits is 3600, while the sum is 29.

The square root of 51561146 is about 7180.6090270951. The cubic root of 51561146 is about 372.1981302823.

The spelling of 51561146 in words is "fifty-one million, five hundred sixty-one thousand, one hundred forty-six".