51307263 has 72 divisors (see below), whose sum is σ = 92951040. Its totient is φ = 28168560.

The previous prime is 51307253. The next prime is 51307279. The reversal of 51307263 is 36270315.

It is a happy number.

It is not a de Polignac number, because 51307263 - 2⁵ = 51307231 is a prime.

It is a hoax number, since the sum of its digits (27) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51307253) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 369048 + ... + 369186.

Almost surely, 2^51307263 is an apocalyptic number.

51307263 is a deficient number, since it is larger than the sum of its proper divisors (41643777).

51307263 is a wasteful number, since it uses less digits than its factorization.

51307263 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 199 (or 180 counting only the distinct ones).

The product of its (nonzero) digits is 3780, while the sum is 27.

The square root of 51307263 is about 7162.9088364993. The cubic root of 51307263 is about 371.5862334967.

Adding to 51307263 its reverse (36270315), we get a palindrome (87577578).

The spelling of 51307263 in words is "fifty-one million, three hundred seven thousand, two hundred sixty-three".