51173000019 has 8 divisors (see below), whose sum is σ = 75811851920. Its totient is φ = 34115333328.

The previous prime is 51172999987. The next prime is 51173000051. The reversal of 51173000019 is 91000037115.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (51172999987) and next prime (51173000051).

It is not a de Polignac number, because 51173000019 - 2⁵ = 51172999987 is a prime.

It is a super-2 number, since 2×51173000019² (a number of 22 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27), and also a Moran number because the ratio is a prime number: 1895296297 = 51173000019 / (5 + 1 + 1 + 7 + 3 + 0 + 0 + 0 + 0 + 1 + 9).

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 51172999956 and 51173000001.

It is not an unprimeable number, because it can be changed into a prime (51173000089) 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, 947648122 + ... + 947648175.

It is an arithmetic number, because the mean of its divisors is an integer number (9476481490).

Almost surely, 2^51173000019 is an apocalyptic number.

51173000019 is a deficient number, since it is larger than the sum of its proper divisors (24638851901).

51173000019 is a wasteful number, since it uses less digits than its factorization.

51173000019 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1895296306 (or 1895296300 counting only the distinct ones).

The product of its (nonzero) digits is 945, while the sum is 27.

The spelling of 51173000019 in words is "fifty-one billion, one hundred seventy-three million, nineteen", and thus it is an aban number.