51027191 has 4 divisors (see below), whose sum is σ = 51046800. Its totient is φ = 51007584.

The previous prime is 51027187. The next prime is 51027199. The reversal of 51027191 is 19172015.

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 51027191 - 2² = 51027187 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 51027191.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51027199) 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, 5171 + ... + 11348.

It is an arithmetic number, because the mean of its divisors is an integer number (12761700).

Almost surely, 2^51027191 is an apocalyptic number.

51027191 is a deficient number, since it is larger than the sum of its proper divisors (19609).

51027191 is a wasteful number, since it uses less digits than its factorization.

51027191 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19608.

The product of its (nonzero) digits is 630, while the sum is 26.

The square root of 51027191 is about 7143.3319256493. The cubic root of 51027191 is about 370.9088710434.

The spelling of 51027191 in words is "fifty-one million, twenty-seven thousand, one hundred ninety-one".