171621313 has 4 divisors (see below), whose sum is σ = 171687600. Its totient is φ = 171555028.

The previous prime is 171621283. The next prime is 171621353. The reversal of 171621313 is 313126171.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 171621313 - 2²⁵ = 138066881 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (171621353) 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, 29095 + ... + 34492.

It is an arithmetic number, because the mean of its divisors is an integer number (42921900).

Almost surely, 2^171621313 is an apocalyptic number.

It is an amenable number.

171621313 is a deficient number, since it is larger than the sum of its proper divisors (66287).

171621313 is an equidigital number, since it uses as much as digits as its factorization.

171621313 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 66286.

The product of its digits is 756, while the sum is 25.

The square root of 171621313 is about 13100.4317867771. The cubic root of 171621313 is about 555.7213389340.

Adding to 171621313 its reverse (313126171), we get a palindrome (484747484).

The spelling of 171621313 in words is "one hundred seventy-one million, six hundred twenty-one thousand, three hundred thirteen".