51131062447 has 4 divisors (see below), whose sum is σ = 51133031656. Its totient is φ = 51129093240.

The previous prime is 51131062427. The next prime is 51131062487. The reversal of 51131062447 is 74426013115.

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 51131062447 - 2⁷ = 51131062319 is a prime.

It is a super-2 number, since 2×51131062447² (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 (51131062427) 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, 945129 + ... + 997762.

It is an arithmetic number, because the mean of its divisors is an integer number (12783257914).

Almost surely, 2^51131062447 is an apocalyptic number.

51131062447 is a deficient number, since it is larger than the sum of its proper divisors (1969209).

51131062447 is a wasteful number, since it uses less digits than its factorization.

51131062447 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1969208.

The product of its (nonzero) digits is 20160, while the sum is 34.

The spelling of 51131062447 in words is "fifty-one billion, one hundred thirty-one million, sixty-two thousand, four hundred forty-seven".