51161706 has 72 divisors (see below), whose sum is σ = 120775200. Its totient is φ = 16230456.

The previous prime is 51161689. The next prime is 51161707. The reversal of 51161706 is 60716115.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a self number, because there is not a number n which added to its sum of digits gives 51161706.

It is not an unprimeable number, because it can be changed into a prime (51161707) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 256995 + ... + 257193.

Almost surely, 2^51161706 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 51161706, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (60387600).

51161706 is an abundant number, since it is smaller than the sum of its proper divisors (69613494).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

51161706 is a wasteful number, since it uses less digits than its factorization.

51161706 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 262 (or 227 counting only the distinct ones).

The product of its (nonzero) digits is 1260, while the sum is 27.

The square root of 51161706 is about 7152.7411528728. The cubic root of 51161706 is about 371.2345080771.

The spelling of 51161706 in words is "fifty-one million, one hundred sixty-one thousand, seven hundred six".