51487169281 has 8 divisors (see below), whose sum is σ = 51877153728. Its totient is φ = 51097830000.

The previous prime is 51487169257. The next prime is 51487169287. The reversal of 51487169281 is 18296178415.

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 51487169281 - 2⁵ = 51487169249 is a prime.

It is a super-2 number, since 2×51487169281² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51487169287) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 475 + ... + 320896.

It is an arithmetic number, because the mean of its divisors is an integer number (6484644216).

Almost surely, 2^51487169281 is an apocalyptic number.

It is an amenable number.

51487169281 is a deficient number, since it is larger than the sum of its proper divisors (389984447).

51487169281 is a wasteful number, since it uses less digits than its factorization.

51487169281 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 322583.

The product of its digits is 967680, while the sum is 52.

The spelling of 51487169281 in words is "fifty-one billion, four hundred eighty-seven million, one hundred sixty-nine thousand, two hundred eighty-one".