51112109 has 4 divisors (see below), whose sum is σ = 53802240. Its totient is φ = 48421980.

The previous prime is 51112091. The next prime is 51112151. The reversal of 51112109 is 90121115.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-51112109 is a prime.

It is a super-2 number, since 2×51112109² = 5224895372855762, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51112169) 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, 1345037 + ... + 1345074.

It is an arithmetic number, because the mean of its divisors is an integer number (13450560).

Almost surely, 2^51112109 is an apocalyptic number.

It is an amenable number.

51112109 is a deficient number, since it is larger than the sum of its proper divisors (2690131).

51112109 is a wasteful number, since it uses less digits than its factorization.

51112109 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2690130.

The product of its (nonzero) digits is 90, while the sum is 20.

The square root of 51112109 is about 7149.2733197158. The cubic root of 51112109 is about 371.1145090113.

The spelling of 51112109 in words is "fifty-one million, one hundred twelve thousand, one hundred nine".