51527909 has 4 divisors (see below), whose sum is σ = 51563916. Its totient is φ = 51491904.

The previous prime is 51527899. The next prime is 51527923. The reversal of 51527909 is 90972515.

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 45292900 + 6235009 = 6730^2 + 2497^2 .

It is a cyclic number.

It is not a de Polignac number, because 51527909 - 2¹⁶ = 51462373 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51527989) 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, 15764 + ... + 18749.

It is an arithmetic number, because the mean of its divisors is an integer number (12890979).

Almost surely, 2^51527909 is an apocalyptic number.

It is an amenable number.

51527909 is a deficient number, since it is larger than the sum of its proper divisors (36007).

51527909 is a wasteful number, since it uses less digits than its factorization.

51527909 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36006.

The product of its (nonzero) digits is 28350, while the sum is 38.

The square root of 51527909 is about 7178.2942960010. The cubic root of 51527909 is about 372.1181384714.

The spelling of 51527909 in words is "fifty-one million, five hundred twenty-seven thousand, nine hundred nine".