51199927 has 4 divisors (see below), whose sum is σ = 53894680. Its totient is φ = 48505176.

The previous prime is 51199921. The next prime is 51199943. The reversal of 51199927 is 72999115.

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

It is not a de Polignac number, because 51199927 - 2¹¹ = 51197879 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 (51199921) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1347348 + ... + 1347385.

It is an arithmetic number, because the mean of its divisors is an integer number (13473670).

Almost surely, 2^51199927 is an apocalyptic number.

51199927 is a deficient number, since it is larger than the sum of its proper divisors (2694753).

51199927 is a wasteful number, since it uses less digits than its factorization.

51199927 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2694752.

The product of its digits is 51030, while the sum is 43.

The square root of 51199927 is about 7155.4124269674. The cubic root of 51199927 is about 371.3269302119.

The spelling of 51199927 in words is "fifty-one million, one hundred ninety-nine thousand, nine hundred twenty-seven".