51105905 has 8 divisors (see below), whose sum is σ = 61959912. Its totient is φ = 40462848.

The previous prime is 51105889. The next prime is 51105911. The reversal of 51105905 is 50950115.

It can be written as a sum of positive squares in 4 ways, for example, as 69169 + 51036736 = 263^2 + 7144^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 51105905 - 2⁴ = 51105889 is a prime.

It is a super-2 number, since 2×51105905² = 5223627051738050, which contains 22 as substring.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 52202 + ... + 53171.

It is an arithmetic number, because the mean of its divisors is an integer number (7744989).

Almost surely, 2^51105905 is an apocalyptic number.

It is an amenable number.

51105905 is a deficient number, since it is larger than the sum of its proper divisors (10854007).

51105905 is a wasteful number, since it uses less digits than its factorization.

51105905 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 105475.

The product of its (nonzero) digits is 1125, while the sum is 26.

The square root of 51105905 is about 7148.8394162969. The cubic root of 51105905 is about 371.0994930812.

The spelling of 51105905 in words is "fifty-one million, one hundred five thousand, nine hundred five".