51543697 has 4 divisors (see below), whose sum is σ = 51860080. Its totient is φ = 51227316.

The previous prime is 51543691. The next prime is 51543733. The reversal of 51543697 is 79634515.

51543697 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 51543697 - 2³ = 51543689 is a prime.

It is not an unprimeable number, because it can be changed into a prime (51543691) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 157947 + ... + 158272.

It is an arithmetic number, because the mean of its divisors is an integer number (12965020).

Almost surely, 2^51543697 is an apocalyptic number.

It is an amenable number.

51543697 is a deficient number, since it is larger than the sum of its proper divisors (316383).

51543697 is a wasteful number, since it uses less digits than its factorization.

51543697 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 316382.

The product of its digits is 113400, while the sum is 40.

The square root of 51543697 is about 7179.3939159235. The cubic root of 51543697 is about 372.1561398921.

The spelling of 51543697 in words is "fifty-one million, five hundred forty-three thousand, six hundred ninety-seven".