51684545 has 12 divisors (see below), whose sum is σ = 68173140. Its totient is φ = 37588320.

The previous prime is 51684527. The next prime is 51684547. The reversal of 51684545 is 54548615.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 6512704 + 45171841 = 2552^2 + 6721^2 .

It is not a de Polignac number, because 51684545 - 2²² = 47490241 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 51684499 and 51684508.

It is not an unprimeable number, because it can be changed into a prime (51684547) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 42110 + ... + 43319.

It is an arithmetic number, because the mean of its divisors is an integer number (5681095).

Almost surely, 2^51684545 is an apocalyptic number.

51684545 is a gapful number since it is divisible by the number (55) formed by its first and last digit.

It is an amenable number.

51684545 is a deficient number, since it is larger than the sum of its proper divisors (16488595).

51684545 is a wasteful number, since it uses less digits than its factorization.

51684545 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 85456 (or 85445 counting only the distinct ones).

The product of its digits is 96000, while the sum is 38.

The square root of 51684545 is about 7189.1964085007. The cubic root of 51684545 is about 372.4948154767.

The spelling of 51684545 in words is "fifty-one million, six hundred eighty-four thousand, five hundred forty-five".