51504646 has 4 divisors (see below), whose sum is σ = 77256972. Its totient is φ = 25752322.

The previous prime is 51504641. The next prime is 51504707. The reversal of 51504646 is 64640515.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 64640515 = 5 ⋅12928103.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51504641) by changing a digit.

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 as a sum of consecutive naturals, namely, 12876160 + ... + 12876163.

It is an arithmetic number, because the mean of its divisors is an integer number (19314243).

Almost surely, 2^51504646 is an apocalyptic number.

51504646 is a deficient number, since it is larger than the sum of its proper divisors (25752326).

51504646 is a wasteful number, since it uses less digits than its factorization.

51504646 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25752325.

The product of its (nonzero) digits is 14400, while the sum is 31.

The square root of 51504646 is about 7176.6737420618. The cubic root of 51504646 is about 372.0621307178.

The spelling of 51504646 in words is "fifty-one million, five hundred four thousand, six hundred forty-six".