51440063 has 4 divisors (see below), whose sum is σ = 51631560. Its totient is φ = 51248568.

The previous prime is 51440047. The next prime is 51440071. The reversal of 51440063 is 36004415.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 51440063 - 2⁴ = 51440047 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 (51440003) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 95345 + ... + 95882.

It is an arithmetic number, because the mean of its divisors is an integer number (12907890).

Almost surely, 2^51440063 is an apocalyptic number.

51440063 is a deficient number, since it is larger than the sum of its proper divisors (191497).

51440063 is a wasteful number, since it uses less digits than its factorization.

51440063 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 191496.

The product of its (nonzero) digits is 1440, while the sum is 23.

The square root of 51440063 is about 7172.1728227923. The cubic root of 51440063 is about 371.9065529144.

Adding to 51440063 its reverse (36004415), we get a palindrome (87444478).

The spelling of 51440063 in words is "fifty-one million, four hundred forty thousand, sixty-three".