51191754013 has 4 divisors (see below), whose sum is σ = 52956986940. Its totient is φ = 49426521088.

The previous prime is 51191754007. The next prime is 51191754041. The reversal of 51191754013 is 31045719115.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 34446617604 + 16745136409 = 185598^2 + 129403^2 .

It is a cyclic number.

It is not a de Polignac number, because 51191754013 - 2⁵ = 51191753981 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51191754413) 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, 882616420 + ... + 882616477.

It is an arithmetic number, because the mean of its divisors is an integer number (13239246735).

Almost surely, 2^51191754013 is an apocalyptic number.

It is an amenable number.

51191754013 is a deficient number, since it is larger than the sum of its proper divisors (1765232927).

51191754013 is a wasteful number, since it uses less digits than its factorization.

51191754013 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1765232926.

The product of its (nonzero) digits is 18900, while the sum is 37.

The spelling of 51191754013 in words is "fifty-one billion, one hundred ninety-one million, seven hundred fifty-four thousand, thirteen".