51040263 has 4 divisors (see below), whose sum is σ = 68053688. Its totient is φ = 34026840.

The previous prime is 51040259. The next prime is 51040271. The reversal of 51040263 is 36204015.

It is a happy number.

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

It is not a de Polignac number, because 51040263 - 2² = 51040259 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 (51040763) 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, 8506708 + ... + 8506713.

It is an arithmetic number, because the mean of its divisors is an integer number (17013422).

Almost surely, 2^51040263 is an apocalyptic number.

51040263 is a deficient number, since it is larger than the sum of its proper divisors (17013425).

51040263 is a wasteful number, since it uses less digits than its factorization.

51040263 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17013424.

The product of its (nonzero) digits is 720, while the sum is 21.

The square root of 51040263 is about 7144.2468462393. The cubic root of 51040263 is about 370.9405411308.

Adding to 51040263 its reverse (36204015), we get a palindrome (87244278).

The spelling of 51040263 in words is "fifty-one million, forty thousand, two hundred sixty-three".