51948147191 has 4 divisors (see below), whose sum is σ = 52462485384. Its totient is φ = 51433809000.

The previous prime is 51948147187. The next prime is 51948147193. The reversal of 51948147191 is 19174184915.

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 51948147191 - 2² = 51948147187 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 (51948147193) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 257168945 + ... + 257169146.

It is an arithmetic number, because the mean of its divisors is an integer number (13115621346).

Almost surely, 2^51948147191 is an apocalyptic number.

51948147191 is a deficient number, since it is larger than the sum of its proper divisors (514338193).

51948147191 is a wasteful number, since it uses less digits than its factorization.

51948147191 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 514338192.

The product of its digits is 362880, while the sum is 50.

The spelling of 51948147191 in words is "fifty-one billion, nine hundred forty-eight million, one hundred forty-seven thousand, one hundred ninety-one".