51319591 has 4 divisors (see below), whose sum is σ = 51346800. Its totient is φ = 51292384.

The previous prime is 51319571. The next prime is 51319607. The reversal of 51319591 is 19591315.

51319591 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.

It is a cyclic number.

It is not a de Polignac number, because 51319591 - 2¹³ = 51311399 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 (51319501) 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, 10546 + ... + 14623.

It is an arithmetic number, because the mean of its divisors is an integer number (12836700).

Almost surely, 2^51319591 is an apocalyptic number.

51319591 is a deficient number, since it is larger than the sum of its proper divisors (27209).

51319591 is a wasteful number, since it uses less digits than its factorization.

51319591 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27208.

The product of its digits is 6075, while the sum is 34.

The square root of 51319591 is about 7163.7693290613. The cubic root of 51319591 is about 371.6159924299.

The spelling of 51319591 in words is "fifty-one million, three hundred nineteen thousand, five hundred ninety-one".