51191115 has 8 divisors (see below), whose sum is σ = 81905808. Its totient is φ = 27301920.

The previous prime is 51191069. The next prime is 51191141. The reversal of 51191115 is 51119115.

51191115 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 51191115 - 2⁷ = 51190987 is a prime.

It is a super-3 number, since 3×51191115³ (a number of 24 digits) contains 333 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1706356 + ... + 1706385.

It is an arithmetic number, because the mean of its divisors is an integer number (10238226).

Almost surely, 2^51191115 is an apocalyptic number.

51191115 is a deficient number, since it is larger than the sum of its proper divisors (30714693).

51191115 is a wasteful number, since it uses less digits than its factorization.

51191115 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3412749.

The product of its digits is 225, while the sum is 24.

The square root of 51191115 is about 7154.7966428124. The cubic root of 51191115 is about 371.3056260106.

The spelling of 51191115 in words is "fifty-one million, one hundred ninety-one thousand, one hundred fifteen".