51161217249 has 4 divisors (see below), whose sum is σ = 68214956336. Its totient is φ = 34107478164.

The previous prime is 51161217199. The next prime is 51161217251. The reversal of 51161217249 is 94271216115.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 51161217249 - 2⁹ = 51161216737 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51161217269) 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, 8526869539 + ... + 8526869544.

It is an arithmetic number, because the mean of its divisors is an integer number (17053739084).

Almost surely, 2^51161217249 is an apocalyptic number.

It is an amenable number.

51161217249 is a deficient number, since it is larger than the sum of its proper divisors (17053739087).

51161217249 is a wasteful number, since it uses less digits than its factorization.

51161217249 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17053739086.

The product of its digits is 30240, while the sum is 39.

The spelling of 51161217249 in words is "fifty-one billion, one hundred sixty-one million, two hundred seventeen thousand, two hundred forty-nine".