51171925019 has 4 divisors (see below), whose sum is σ = 51178794744. Its totient is φ = 51165055296.

The previous prime is 51171925003. The next prime is 51171925039. The reversal of 51171925019 is 91052917115.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 91052917115 = 5 ⋅18210583423.

It is a cyclic number.

It is not a de Polignac number, because 51171925019 - 2⁴ = 51171925003 is a prime.

It is a super-2 number, since 2×51171925019² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51171925039) 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, 3423677 + ... + 3438590.

It is an arithmetic number, because the mean of its divisors is an integer number (12794698686).

Almost surely, 2^51171925019 is an apocalyptic number.

51171925019 is a deficient number, since it is larger than the sum of its proper divisors (6869725).

51171925019 is an equidigital number, since it uses as much as digits as its factorization.

51171925019 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6869724.

The product of its (nonzero) digits is 28350, while the sum is 41.

The spelling of 51171925019 in words is "fifty-one billion, one hundred seventy-one million, nine hundred twenty-five thousand, nineteen".