51047771 has 4 divisors (see below), whose sum is σ = 51261600. Its totient is φ = 50833944.

The previous prime is 51047671. The next prime is 51047779. The reversal of 51047771 is 17774015.

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 51047771 - 2¹⁸ = 50785627 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51047779) 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, 106556 + ... + 107033.

It is an arithmetic number, because the mean of its divisors is an integer number (12815400).

Almost surely, 2^51047771 is an apocalyptic number.

51047771 is a deficient number, since it is larger than the sum of its proper divisors (213829).

51047771 is a wasteful number, since it uses less digits than its factorization.

51047771 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 213828.

The product of its (nonzero) digits is 6860, while the sum is 32.

The square root of 51047771 is about 7144.7722846848. The cubic root of 51047771 is about 370.9587286353.

The spelling of 51047771 in words is "fifty-one million, forty-seven thousand, seven hundred seventy-one".