51025313 has 4 divisors (see below), whose sum is σ = 54026820. Its totient is φ = 48023808.

The previous prime is 51025291. The next prime is 51025319. The reversal of 51025313 is 31352015.

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

It can be written as a sum of positive squares in 2 ways, for example, as 18386944 + 32638369 = 4288^2 + 5713^2 .

It is a cyclic number.

It is not a de Polignac number, because 51025313 - 2⁸ = 51025057 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51025319) 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, 1500728 + ... + 1500761.

It is an arithmetic number, because the mean of its divisors is an integer number (13506705).

Almost surely, 2^51025313 is an apocalyptic number.

It is an amenable number.

51025313 is a deficient number, since it is larger than the sum of its proper divisors (3001507).

51025313 is a wasteful number, since it uses less digits than its factorization.

51025313 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3001506.

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

The square root of 51025313 is about 7143.2004731773. The cubic root of 51025313 is about 370.9043206890.

Adding to 51025313 its reverse (31352015), we get a palindrome (82377328).

The spelling of 51025313 in words is "fifty-one million, twenty-five thousand, three hundred thirteen".