51051109 has 4 divisors (see below), whose sum is σ = 52296300. Its totient is φ = 49805920.

The previous prime is 51051103. The next prime is 51051113. The reversal of 51051109 is 90115015.

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

It can be written as a sum of positive squares in 2 ways, for example, as 3744225 + 47306884 = 1935^2 + 6878^2 .

It is a cyclic number.

It is not a de Polignac number, because 51051109 - 2⁷ = 51050981 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 51051109.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51051103) 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, 622534 + ... + 622615.

It is an arithmetic number, because the mean of its divisors is an integer number (13074075).

Almost surely, 2^51051109 is an apocalyptic number.

It is an amenable number.

51051109 is a deficient number, since it is larger than the sum of its proper divisors (1245191).

51051109 is a wasteful number, since it uses less digits than its factorization.

51051109 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1245190.

The product of its (nonzero) digits is 225, while the sum is 22.

The square root of 51051109 is about 7145.0058782341. The cubic root of 51051109 is about 370.9668140895.

The spelling of 51051109 in words is "fifty-one million, fifty-one thousand, one hundred nine".