173142840509 has 4 divisors (see below), whose sum is σ = 175514660316. Its totient is φ = 170771020704.

The previous prime is 173142840503. The next prime is 173142840511. The reversal of 173142840509 is 905048241371.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 905048241371 = 219071 ⋅4131301.

It can be written as a sum of positive squares in 2 ways, for example, as 51797208100 + 121345632409 = 227590^2 + 348347^2 .

It is a cyclic number.

It is not a de Polignac number, because 173142840509 - 2²⁴ = 173126063293 is a prime.

It is a super-2 number, since 2×173142840509² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 173142840509.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (173142840503) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1185909794 + ... + 1185909939.

It is an arithmetic number, because the mean of its divisors is an integer number (43878665079).

Almost surely, 2^173142840509 is an apocalyptic number.

It is an amenable number.

173142840509 is a deficient number, since it is larger than the sum of its proper divisors (2371819807).

173142840509 is an equidigital number, since it uses as much as digits as its factorization.

173142840509 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2371819806.

The product of its (nonzero) digits is 241920, while the sum is 44.

The spelling of 173142840509 in words is "one hundred seventy-three billion, one hundred forty-two million, eight hundred forty thousand, five hundred nine".