51919111 has 4 divisors (see below), whose sum is σ = 51972912. Its totient is φ = 51865312.

The previous prime is 51919081. The next prime is 51919121. The reversal of 51919111 is 11191915.

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 51919111 - 2⁹ = 51918599 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 51919111.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51919121) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 25426 + ... + 27391.

It is an arithmetic number, because the mean of its divisors is an integer number (12993228).

Almost surely, 2^51919111 is an apocalyptic number.

51919111 is a deficient number, since it is larger than the sum of its proper divisors (53801).

51919111 is an equidigital number, since it uses as much as digits as its factorization.

51919111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 53800.

The product of its digits is 405, while the sum is 28.

The square root of 51919111 is about 7205.4917250664. The cubic root of 51919111 is about 373.0574773604.

The spelling of 51919111 in words is "fifty-one million, nine hundred nineteen thousand, one hundred eleven".