51865345 has 32 divisors (see below), whose sum is σ = 78151680. Its totient is φ = 32218560.

The previous prime is 51865343. The next prime is 51865397. The reversal of 51865345 is 54356815.

It is not a de Polignac number, because 51865345 - 2¹ = 51865343 is a prime.

It is not an unprimeable number, because it can be changed into a prime (51865343) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 13600 + ... + 16990.

It is an arithmetic number, because the mean of its divisors is an integer number (2442240).

Almost surely, 2^51865345 is an apocalyptic number.

It is an amenable number.

51865345 is a deficient number, since it is larger than the sum of its proper divisors (26286335).

51865345 is a wasteful number, since it uses less digits than its factorization.

51865345 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3445.

The product of its digits is 72000, while the sum is 37.

The square root of 51865345 is about 7201.7598543689. The cubic root of 51865345 is about 372.9286568696.

The spelling of 51865345 in words is "fifty-one million, eight hundred sixty-five thousand, three hundred forty-five".