51561773 has 16 divisors (see below), whose sum is σ = 55689216. Its totient is φ = 47643120.

The previous prime is 51561767. The next prime is 51561779. The reversal of 51561773 is 37716515.

It is an interprime number because it is at equal distance from previous prime (51561767) and next prime (51561779).

It is a cyclic number.

It is not a de Polignac number, because 51561773 - 2²⁴ = 34784557 is a prime.

It is a Smith number, since the sum of its digits (35) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51561779) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 62240 + ... + 63062.

It is an arithmetic number, because the mean of its divisors is an integer number (3480576).

Almost surely, 2^51561773 is an apocalyptic number.

It is an amenable number.

51561773 is a deficient number, since it is larger than the sum of its proper divisors (4127443).

51561773 is a wasteful number, since it uses less digits than its factorization.

51561773 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 944.

The product of its digits is 22050, while the sum is 35.

The square root of 51561773 is about 7180.6526862117. The cubic root of 51561773 is about 372.1996389589.

The spelling of 51561773 in words is "fifty-one million, five hundred sixty-one thousand, seven hundred seventy-three".