51523805 has 4 divisors (see below), whose sum is σ = 61828572. Its totient is φ = 41219040.

The previous prime is 51523783. The next prime is 51523853. The reversal of 51523805 is 50832515.

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 18472804 + 33051001 = 4298^2 + 5749^2 .

It is not a de Polignac number, because 51523805 - 2¹⁰ = 51522781 is a prime.

It is a Duffinian number.

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, 5152376 + ... + 5152385.

It is an arithmetic number, because the mean of its divisors is an integer number (15457143).

Almost surely, 2^51523805 is an apocalyptic number.

It is an amenable number.

51523805 is a deficient number, since it is larger than the sum of its proper divisors (10304767).

51523805 is a wasteful number, since it uses less digits than its factorization.

51523805 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10304766.

The product of its (nonzero) digits is 6000, while the sum is 29.

The square root of 51523805 is about 7178.0084285267. The cubic root of 51523805 is about 372.1082589490.

The spelling of 51523805 in words is "fifty-one million, five hundred twenty-three thousand, eight hundred five".