51442097791 has 4 divisors (see below), whose sum is σ = 58790968912. Its totient is φ = 44093226672.

The previous prime is 51442097771. The next prime is 51442097797. The reversal of 51442097791 is 19779024415.

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 51442097791 - 2⁹ = 51442097279 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 (51442097797) 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, 3674435550 + ... + 3674435563.

It is an arithmetic number, because the mean of its divisors is an integer number (14697742228).

Almost surely, 2^51442097791 is an apocalyptic number.

51442097791 is a deficient number, since it is larger than the sum of its proper divisors (7348871121).

51442097791 is an equidigital number, since it uses as much as digits as its factorization.

51442097791 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7348871120.

The product of its (nonzero) digits is 635040, while the sum is 49.

The spelling of 51442097791 in words is "fifty-one billion, four hundred forty-two million, ninety-seven thousand, seven hundred ninety-one".