51064421 has 4 divisors (see below), whose sum is σ = 51437292. Its totient is φ = 50691552.

The previous prime is 51064417. The next prime is 51064451. The reversal of 51064421 is 12446015.

51064421 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.

It can be written as a sum of positive squares in 2 ways, for example, as 37039396 + 14025025 = 6086^2 + 3745^2 .

It is a cyclic number.

It is not a de Polignac number, because 51064421 - 2² = 51064417 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51064411) by changing a digit.

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, 186230 + ... + 186503.

It is an arithmetic number, because the mean of its divisors is an integer number (12859323).

Almost surely, 2^51064421 is an apocalyptic number.

It is an amenable number.

51064421 is a deficient number, since it is larger than the sum of its proper divisors (372871).

51064421 is a wasteful number, since it uses less digits than its factorization.

51064421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 372870.

The product of its (nonzero) digits is 960, while the sum is 23.

The square root of 51064421 is about 7145.9373772795. The cubic root of 51064421 is about 370.9990555116. Note that the first 3 decimals are identical.

The spelling of 51064421 in words is "fifty-one million, sixty-four thousand, four hundred twenty-one".