51155564 has 6 divisors (see below), whose sum is σ = 89522244. Its totient is φ = 25577780.

The previous prime is 51155561. The next prime is 51155579. The reversal of 51155564 is 46555115.

It is a self number, because there is not a number n which added to its sum of digits gives 51155564.

It is not an unprimeable number, because it can be changed into a prime (51155561) 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 as a sum of consecutive naturals, namely, 6394442 + ... + 6394449.

It is an arithmetic number, because the mean of its divisors is an integer number (14920374).

Almost surely, 2^51155564 is an apocalyptic number.

It is an amenable number.

51155564 is a deficient number, since it is larger than the sum of its proper divisors (38366680).

51155564 is a wasteful number, since it uses less digits than its factorization.

51155564 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12788895 (or 12788893 counting only the distinct ones).

The product of its digits is 15000, while the sum is 32.

The square root of 51155564 is about 7152.3117940985. The cubic root of 51155564 is about 371.2196518251.

The spelling of 51155564 in words is "fifty-one million, one hundred fifty-five thousand, five hundred sixty-four".