51561670 has 16 divisors (see below), whose sum is σ = 93006000. Its totient is φ = 20581344.

The previous prime is 51561637. The next prime is 51561673. The reversal of 51561670 is 7616515.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51561673) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 177 + ... + 10156.

It is an arithmetic number, because the mean of its divisors is an integer number (5812875).

Almost surely, 2^51561670 is an apocalyptic number.

51561670 is a deficient number, since it is larger than the sum of its proper divisors (41444330).

51561670 is a wasteful number, since it uses less digits than its factorization.

51561670 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10839.

The product of its (nonzero) digits is 6300, while the sum is 31.

The square root of 51561670 is about 7180.6455141582. The cubic root of 51561670 is about 372.1993911229.

The spelling of 51561670 in words is "fifty-one million, five hundred sixty-one thousand, six hundred seventy".