51871209495889 has 15 divisors (see below), whose sum is σ = 60513222113673. Its totient is φ = 44460734219748.

The previous prime is 51871209495881. The next prime is 51871209495899. The reversal of 51871209495889 is 98859490217815.

It is a happy number.

The square root of 51871209495889 is 7202167.

It is a perfect power (a square), and thus also a powerful number.

It is not a de Polignac number, because 51871209495889 - 2³ = 51871209495881 is a prime.

It is not an unprimeable number, because it can be changed into a prime (51871209495881) by changing a digit.

It is a polite number, since it can be written in 14 ways as a sum of consecutive naturals, for example, 352832692 + ... + 352979674.

Almost surely, 2^{51871209495889} is an apocalyptic number.

51871209495889 is the 7202167-th square number.

51871209495889 is the 3601084-th centered octagonal number.

It is an amenable number.

51871209495889 is a deficient number, since it is larger than the sum of its proper divisors (8642012617784).

51871209495889 is an frugal number, since it uses more digits than its factorization.

51871209495889 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 293994 (or 146990 counting only the distinct ones).

The product of its (nonzero) digits is 522547200, while the sum is 76.

The spelling of 51871209495889 in words is "fifty-one trillion, eight hundred seventy-one billion, two hundred nine million, four hundred ninety-five thousand, eight hundred eighty-nine".