51145331 has 4 divisors (see below), whose sum is σ = 51277200. Its totient is φ = 51013464.

The previous prime is 51145309. The next prime is 51145343. The reversal of 51145331 is 13354115.

51145331 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a cyclic number.

It is not a de Polignac number, because 51145331 - 2¹⁰ = 51144307 is a prime.

It is a super-2 number, since 2×51145331² = 5231689766199122, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 51145297 and 51145306.

It is not an unprimeable number, because it can be changed into a prime (51105331) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 65351 + ... + 66128.

It is an arithmetic number, because the mean of its divisors is an integer number (12819300).

Almost surely, 2^51145331 is an apocalyptic number.

51145331 is a deficient number, since it is larger than the sum of its proper divisors (131869).

51145331 is a wasteful number, since it uses less digits than its factorization.

51145331 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 131868.

The product of its digits is 900, while the sum is 23.

The square root of 51145331 is about 7151.5963952114. The cubic root of 51145331 is about 371.1948976327.

Adding to 51145331 its reverse (13354115), we get a palindrome (64499446).

The spelling of 51145331 in words is "fifty-one million, one hundred forty-five thousand, three hundred thirty-one".