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51520045 = 510304009

51520045 has 4 divisors (see below), whose sum is σ = 61824060. Its totient is φ = 41216032.

The previous prime is 51520043. The next prime is 51520093. The reversal of 51520045 is 54002515.

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 37785609 + 13734436 = 6147^2 + 3706^2 .

It is a cyclic number.

It is not a de Polignac number, because 51520045 - 21 = 51520043 is a prime.

It is a Smith number, since the sum of its digits (22) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a junction number, because it is equal to n+sod(n) for n = 51519998 and 51520025.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51520043) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5152000 + ... + 5152009.

It is an arithmetic number, because the mean of its divisors is an integer number (15456015).

Almost surely, 251520045 is an apocalyptic number.

It is an amenable number.

51520045 is a deficient number, since it is larger than the sum of its proper divisors (10304015).

51520045 is a wasteful number, since it uses less digits than its factorization.

51520045 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10304014.

The product of its (nonzero) digits is 1000, while the sum is 22.

The square root of 51520045 is about 7177.7465126598. The cubic root of 51520045 is about 372.0992070743.

The spelling of 51520045 in words is "fifty-one million, five hundred twenty thousand, forty-five".

Divisors: 1 5 10304009 51520045