51027791 has 4 divisors (see below), whose sum is σ = 52787400. Its totient is φ = 49268184.

The previous prime is 51027737. The next prime is 51027793. The reversal of 51027791 is 19772015.

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 51027791 - 2¹⁸ = 50765647 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51027793) 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, 879761 + ... + 879818.

It is an arithmetic number, because the mean of its divisors is an integer number (13196850).

Almost surely, 2^51027791 is an apocalyptic number.

51027791 is a deficient number, since it is larger than the sum of its proper divisors (1759609).

51027791 is a wasteful number, since it uses less digits than its factorization.

51027791 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1759608.

The product of its (nonzero) digits is 4410, while the sum is 32.

The square root of 51027791 is about 7143.3739227343. The cubic root of 51027791 is about 370.9103248072.

The spelling of 51027791 in words is "fifty-one million, twenty-seven thousand, seven hundred ninety-one".