51234349691 has 8 divisors (see below), whose sum is σ = 58586323200. Its totient is φ = 43890571368.

The previous prime is 51234349651. The next prime is 51234349693. The reversal of 51234349691 is 19694343215.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 51234349691 - 2¹⁸ = 51234087547 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51234349693) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2035391 + ... + 2060408.

It is an arithmetic number, because the mean of its divisors is an integer number (7323290400).

Almost surely, 2^51234349691 is an apocalyptic number.

51234349691 is a deficient number, since it is larger than the sum of its proper divisors (7351973509).

51234349691 is a wasteful number, since it uses less digits than its factorization.

51234349691 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4097593.

The product of its digits is 699840, while the sum is 47.

The spelling of 51234349691 in words is "fifty-one billion, two hundred thirty-four million, three hundred forty-nine thousand, six hundred ninety-one".