51305263 has 8 divisors (see below), whose sum is σ = 55868400. Its totient is φ = 46928448.

The previous prime is 51305257. The next prime is 51305297. The reversal of 51305263 is 36250315.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 51305263 - 2⁹ = 51304751 is a prime.

It is a super-2 number, since 2×51305263² = 5264460022998338, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51305363) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 46006 + ... + 47107.

It is an arithmetic number, because the mean of its divisors is an integer number (6983550).

Almost surely, 2^51305263 is an apocalyptic number.

51305263 is a deficient number, since it is larger than the sum of its proper divisors (4563137).

51305263 is a wasteful number, since it uses less digits than its factorization.

51305263 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 93161.

The product of its (nonzero) digits is 2700, while the sum is 25.

The square root of 51305263 is about 7162.7692270518. The cubic root of 51305263 is about 371.5814051866.

Adding to 51305263 its reverse (36250315), we get a palindrome (87555578).

The spelling of 51305263 in words is "fifty-one million, three hundred five thousand, two hundred sixty-three".