51231305 has 8 divisors (see below), whose sum is σ = 61533000. Its totient is φ = 40948096.

The previous prime is 51231289. The next prime is 51231329. The reversal of 51231305 is 50313215.

51231305 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 10883401 + 40347904 = 3299^2 + 6352^2 .

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 51231305 - 2⁴ = 51231289 is a prime.

It is a super-2 number, since 2×51231305² = 5249293224006050, which contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2471 + ... + 10419.

It is an arithmetic number, because the mean of its divisors is an integer number (7691625).

Almost surely, 2^51231305 is an apocalyptic number.

It is an amenable number.

51231305 is a deficient number, since it is larger than the sum of its proper divisors (10301695).

51231305 is a wasteful number, since it uses less digits than its factorization.

51231305 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9243.

The product of its (nonzero) digits is 450, while the sum is 20.

The square root of 51231305 is about 7157.6046971036. The cubic root of 51231305 is about 371.4027709255.

The spelling of 51231305 in words is "fifty-one million, two hundred thirty-one thousand, three hundred five".