51849502871 has 4 divisors (see below), whose sum is σ = 52827795432. Its totient is φ = 50871210312.

The previous prime is 51849502867. The next prime is 51849502883. The reversal of 51849502871 is 17820594815.

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 51849502871 - 2² = 51849502867 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 (51849502891) 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, 489146201 + ... + 489146306.

It is an arithmetic number, because the mean of its divisors is an integer number (13206948858).

Almost surely, 2^51849502871 is an apocalyptic number.

51849502871 is a deficient number, since it is larger than the sum of its proper divisors (978292561).

51849502871 is an equidigital number, since it uses as much as digits as its factorization.

51849502871 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 978292560.

The product of its (nonzero) digits is 806400, while the sum is 50.

The spelling of 51849502871 in words is "fifty-one billion, eight hundred forty-nine million, five hundred two thousand, eight hundred seventy-one".