51947219509 has 8 divisors (see below), whose sum is σ = 52682771520. Its totient is φ = 51211776000.

The previous prime is 51947219507. The next prime is 51947219561. The reversal of 51947219509 is 90591274915.

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

It is a cyclic number.

It is not a de Polignac number, because 51947219509 - 2¹ = 51947219507 is a prime.

It is a super-2 number, since 2×51947219509² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51947219507) 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, 1803382 + ... + 1831960.

It is an arithmetic number, because the mean of its divisors is an integer number (6585346440).

Almost surely, 2^51947219509 is an apocalyptic number.

It is an amenable number.

51947219509 is a deficient number, since it is larger than the sum of its proper divisors (735552011).

51947219509 is a wasteful number, since it uses less digits than its factorization.

51947219509 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 54251.

The product of its (nonzero) digits is 1020600, while the sum is 52.

The spelling of 51947219509 in words is "fifty-one billion, nine hundred forty-seven million, two hundred nineteen thousand, five hundred nine".