51123605 has 16 divisors (see below), whose sum is σ = 66561264. Its totient is φ = 37470720.

The previous prime is 51123599. The next prime is 51123643. The reversal of 51123605 is 50632115.

It can be written as a sum of positive squares in 8 ways, for example, as 2486929 + 48636676 = 1577^2 + 6974^2 .

It is not a de Polignac number, because 51123605 - 2²⁰ = 50075029 is a prime.

It is a super-2 number, since 2×51123605² = 5227245976392050, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 6035 + ... + 11775.

It is an arithmetic number, because the mean of its divisors is an integer number (4160079).

Almost surely, 2^51123605 is an apocalyptic number.

It is an amenable number.

51123605 is a deficient number, since it is larger than the sum of its proper divisors (15437659).

51123605 is a wasteful number, since it uses less digits than its factorization.

51123605 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5896.

The product of its (nonzero) digits is 900, while the sum is 23.

The square root of 51123605 is about 7150.0772723097. The cubic root of 51123605 is about 371.1423302893.

The spelling of 51123605 in words is "fifty-one million, one hundred twenty-three thousand, six hundred five".