51612818 has 16 divisors (see below), whose sum is σ = 78643224. Its totient is φ = 25401600.

The previous prime is 51612793. The next prime is 51612823. The reversal of 51612818 is 81821615.

It can be written as a sum of positive squares in 4 ways, for example, as 35796289 + 15816529 = 5983^2 + 3977^2 .

It is a super-2 number, since 2×51612818² = 5327765963802248, which contains 22 as substring.

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 7 ways as a sum of consecutive naturals, for example, 39146 + ... + 40442.

Almost surely, 2^51612818 is an apocalyptic number.

51612818 is a deficient number, since it is larger than the sum of its proper divisors (27030406).

51612818 is a wasteful number, since it uses less digits than its factorization.

51612818 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1597.

The product of its digits is 3840, while the sum is 32.

The square root of 51612818 is about 7184.2061496034. The cubic root of 51612818 is about 372.3224215516.

It can be divided in two parts, 516128 and 18, that multiplied together give a square (9290304 = 3048²).

The spelling of 51612818 in words is "fifty-one million, six hundred twelve thousand, eight hundred eighteen".