51551131161 has 4 divisors (see below), whose sum is σ = 68734841552. Its totient is φ = 34367420772.

The previous prime is 51551131153. The next prime is 51551131187. The reversal of 51551131161 is 16113115515.

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 51551131161 - 2³ = 51551131153 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51551131861) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8591855191 + ... + 8591855196.

It is an arithmetic number, because the mean of its divisors is an integer number (17183710388).

Almost surely, 2^51551131161 is an apocalyptic number.

It is an amenable number.

51551131161 is a deficient number, since it is larger than the sum of its proper divisors (17183710391).

51551131161 is a wasteful number, since it uses less digits than its factorization.

51551131161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17183710390.

The product of its digits is 2250, while the sum is 30.

Adding to 51551131161 its reverse (16113115515), we get a palindrome (67664246676).

The spelling of 51551131161 in words is "fifty-one billion, five hundred fifty-one million, one hundred thirty-one thousand, one hundred sixty-one".