51173245 has 4 divisors (see below), whose sum is σ = 61407900. Its totient is φ = 40938592.

The previous prime is 51173233. The next prime is 51173263. The reversal of 51173245 is 54237115.

It is a happy number.

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 20548089 + 30625156 = 4533^2 + 5534^2 .

It is a cyclic number.

It is not a de Polignac number, because 51173245 - 2⁷ = 51173117 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5117320 + ... + 5117329.

It is an arithmetic number, because the mean of its divisors is an integer number (15351975).

Almost surely, 2^51173245 is an apocalyptic number.

It is an amenable number.

51173245 is a deficient number, since it is larger than the sum of its proper divisors (10234655).

51173245 is a wasteful number, since it uses less digits than its factorization.

51173245 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10234654.

The product of its digits is 4200, while the sum is 28.

The square root of 51173245 is about 7153.5477212359. The cubic root of 51173245 is about 371.2624153625.

The spelling of 51173245 in words is "fifty-one million, one hundred seventy-three thousand, two hundred forty-five".