51263513 has 4 divisors (see below), whose sum is σ = 58586880. Its totient is φ = 43940148.

The previous prime is 51263479. The next prime is 51263519. The reversal of 51263513 is 31536215.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 51263513 - 2¹⁰ = 51262489 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51263519) 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 in 3 ways as a sum of consecutive naturals, for example, 3661673 + ... + 3661686.

It is an arithmetic number, because the mean of its divisors is an integer number (14646720).

Almost surely, 2^51263513 is an apocalyptic number.

It is an amenable number.

51263513 is a deficient number, since it is larger than the sum of its proper divisors (7323367).

51263513 is an equidigital number, since it uses as much as digits as its factorization.

51263513 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7323366.

The product of its digits is 2700, while the sum is 26.

The square root of 51263513 is about 7159.8542582933. The cubic root of 51263513 is about 371.4805855517.

Adding to 51263513 its reverse (31536215), we get a palindrome (82799728).

The spelling of 51263513 in words is "fifty-one million, two hundred sixty-three thousand, five hundred thirteen".