51205105 has 32 divisors (see below), whose sum is σ = 76204800. Its totient is φ = 32225280.

The previous prime is 51205093. The next prime is 51205117. The reversal of 51205105 is 50150215.

It is an interprime number because it is at equal distance from previous prime (51205093) and next prime (51205117).

It is not a de Polignac number, because 51205105 - 2⁵ = 51205073 is a prime.

It is a super-2 number, since 2×51205105² = 5243925556122050, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 23346 + ... + 25444.

It is an arithmetic number, because the mean of its divisors is an integer number (2381400).

Almost surely, 2^51205105 is an apocalyptic number.

It is an amenable number.

51205105 is a deficient number, since it is larger than the sum of its proper divisors (24999695).

51205105 is a wasteful number, since it uses less digits than its factorization.

51205105 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2169.

The product of its (nonzero) digits is 250, while the sum is 19.

The square root of 51205105 is about 7155.7742418274. The cubic root of 51205105 is about 371.3394475867.

The spelling of 51205105 in words is "fifty-one million, two hundred five thousand, one hundred five".