51442391219 has 4 divisors (see below), whose sum is σ = 51443517096. Its totient is φ = 51441265344.

The previous prime is 51442391201. The next prime is 51442391267. The reversal of 51442391219 is 91219324415.

It is a happy number.

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 51442391219 - 2²⁰ = 51441342643 is a prime.

It is a super-2 number, since 2×51442391219² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51442391419) 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, 491369 + ... + 586794.

It is an arithmetic number, because the mean of its divisors is an integer number (12860879274).

Almost surely, 2^51442391219 is an apocalyptic number.

51442391219 is a deficient number, since it is larger than the sum of its proper divisors (1125877).

51442391219 is a wasteful number, since it uses less digits than its factorization.

51442391219 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1125876.

The product of its digits is 77760, while the sum is 41.

The spelling of 51442391219 in words is "fifty-one billion, four hundred forty-two million, three hundred ninety-one thousand, two hundred nineteen".