51511345 has 4 divisors (see below), whose sum is σ = 61813620. Its totient is φ = 41209072.

The previous prime is 51511321. The next prime is 51511357. The reversal of 51511345 is 54311515.

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 14447601 + 37063744 = 3801^2 + 6088^2 .

It is a cyclic number.

It is not a de Polignac number, because 51511345 - 2⁷ = 51511217 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5151130 + ... + 5151139.

It is an arithmetic number, because the mean of its divisors is an integer number (15453405).

Almost surely, 2^51511345 is an apocalyptic number.

It is an amenable number.

51511345 is a deficient number, since it is larger than the sum of its proper divisors (10302275).

51511345 is a wasteful number, since it uses less digits than its factorization.

51511345 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10302274.

The product of its digits is 1500, while the sum is 25.

The square root of 51511345 is about 7177.1404472812. The cubic root of 51511345 is about 372.0782608883.

The spelling of 51511345 in words is "fifty-one million, five hundred eleven thousand, three hundred forty-five".