171983813 has 4 divisors (see below), whose sum is σ = 173756940. Its totient is φ = 170210688.

The previous prime is 171983803. The next prime is 171983837. The reversal of 171983813 is 318389171.

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 132319009 + 39664804 = 11503^2 + 6298^2 .

It is a cyclic number.

It is not a de Polignac number, because 171983813 - 2¹⁶ = 171918277 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 (171983803) 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, 886418 + ... + 886611.

It is an arithmetic number, because the mean of its divisors is an integer number (43439235).

Almost surely, 2^171983813 is an apocalyptic number.

It is an amenable number.

171983813 is a deficient number, since it is larger than the sum of its proper divisors (1773127).

171983813 is an equidigital number, since it uses as much as digits as its factorization.

171983813 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1773126.

The product of its digits is 36288, while the sum is 41.

The square root of 171983813 is about 13114.2599104944. The cubic root of 171983813 is about 556.1123302275.

The spelling of 171983813 in words is "one hundred seventy-one million, nine hundred eighty-three thousand, eight hundred thirteen".