51551131405 has 4 divisors (see below), whose sum is σ = 61861357692. Its totient is φ = 41240905120.

The previous prime is 51551131399. The next prime is 51551131453. The reversal of 51551131405 is 50413115515.

It is a happy number.

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 10482892996 + 41068238409 = 102386^2 + 202653^2 .

It is not a de Polignac number, because 51551131405 - 2⁷ = 51551131277 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5155113136 + ... + 5155113145.

It is an arithmetic number, because the mean of its divisors is an integer number (15465339423).

Almost surely, 2^51551131405 is an apocalyptic number.

It is an amenable number.

51551131405 is a deficient number, since it is larger than the sum of its proper divisors (10310226287).

51551131405 is a wasteful number, since it uses less digits than its factorization.

51551131405 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10310226286.

The product of its (nonzero) digits is 7500, while the sum is 31.

The spelling of 51551131405 in words is "fifty-one billion, five hundred fifty-one million, one hundred thirty-one thousand, four hundred five".