51561064 has 16 divisors (see below), whose sum is σ = 97319520. Its totient is φ = 25609200.

The previous prime is 51561061. The next prime is 51561127. The reversal of 51561064 is 46016515.

It is not an unprimeable number, because it can be changed into a prime (51561061) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 20134 + ... + 22549.

It is an arithmetic number, because the mean of its divisors is an integer number (6082470).

Almost surely, 2^51561064 is an apocalyptic number.

It is an amenable number.

51561064 is a deficient number, since it is larger than the sum of its proper divisors (45758456).

51561064 is a wasteful number, since it uses less digits than its factorization.

51561064 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42840 (or 42836 counting only the distinct ones).

The product of its (nonzero) digits is 3600, while the sum is 28.

The square root of 51561064 is about 7180.6033172708. The cubic root of 51561064 is about 372.1979329744.

Adding to 51561064 its reverse (46016515), we get a palindrome (97577579).

The spelling of 51561064 in words is "fifty-one million, five hundred sixty-one thousand, sixty-four".