51831000391 has 8 divisors (see below), whose sum is σ = 55453358000. Its totient is φ = 48298083840.

The previous prime is 51831000367. The next prime is 51831000401. The reversal of 51831000391 is 19300013815.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 51831000391 - 2¹¹ = 51830998343 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 (51831000301) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 22359066 + ... + 22361383.

It is an arithmetic number, because the mean of its divisors is an integer number (6931669750).

Almost surely, 2^51831000391 is an apocalyptic number.

51831000391 is the 143988-th centered pentagonal number.

51831000391 is a deficient number, since it is larger than the sum of its proper divisors (3622357609).

51831000391 is a wasteful number, since it uses less digits than its factorization.

51831000391 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44720529.

The product of its (nonzero) digits is 3240, while the sum is 31.

The spelling of 51831000391 in words is "fifty-one billion, eight hundred thirty-one million, three hundred ninety-one", and thus it is an aban number.