51771187 has 4 divisors (see below), whose sum is σ = 55753600. Its totient is φ = 47788776.

The previous prime is 51771163. The next prime is 51771193. The reversal of 51771187 is 78117715.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 51771187 - 2⁷ = 51771059 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51771107) 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, 1991187 + ... + 1991212.

It is an arithmetic number, because the mean of its divisors is an integer number (13938400).

Almost surely, 2^51771187 is an apocalyptic number.

51771187 is a deficient number, since it is larger than the sum of its proper divisors (3982413).

51771187 is a wasteful number, since it uses less digits than its factorization.

51771187 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3982412.

The product of its digits is 13720, while the sum is 37.

The square root of 51771187 is about 7195.2197325725. The cubic root of 51771187 is about 372.7028446432.

The spelling of 51771187 in words is "fifty-one million, seven hundred seventy-one thousand, one hundred eighty-seven".