51404645 has 4 divisors (see below), whose sum is σ = 61685580. Its totient is φ = 41123712.

The previous prime is 51404623. The next prime is 51404677. The reversal of 51404645 is 54640415.

51404645 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 54640415 = 5 ⋅10928083.

It can be written as a sum of positive squares in 2 ways, for example, as 7540516 + 43864129 = 2746^2 + 6623^2 .

It is a cyclic number.

It is not a de Polignac number, because 51404645 - 2²⁴ = 34627429 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5140460 + ... + 5140469.

It is an arithmetic number, because the mean of its divisors is an integer number (15421395).

Almost surely, 2^51404645 is an apocalyptic number.

It is an amenable number.

51404645 is a deficient number, since it is larger than the sum of its proper divisors (10280935).

51404645 is a wasteful number, since it uses less digits than its factorization.

51404645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10280934.

The product of its (nonzero) digits is 9600, while the sum is 29.

The square root of 51404645 is about 7169.7032714053. The cubic root of 51404645 is about 371.8211771079.

The spelling of 51404645 in words is "fifty-one million, four hundred four thousand, six hundred forty-five".