171621013 has 8 divisors (see below), whose sum is σ = 173092736. Its totient is φ = 170154000.

The previous prime is 171621011. The next prime is 171621067. The reversal of 171621013 is 310126171.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 171621013 - 2¹ = 171621011 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 (171621011) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 123583 + ... + 124963.

It is an arithmetic number, because the mean of its divisors is an integer number (21636592).

Almost surely, 2^171621013 is an apocalyptic number.

It is an amenable number.

171621013 is a deficient number, since it is larger than the sum of its proper divisors (1471723).

171621013 is a wasteful number, since it uses less digits than its factorization.

171621013 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2355.

The product of its (nonzero) digits is 252, while the sum is 22.

The square root of 171621013 is about 13100.4203367678. The cubic root of 171621013 is about 555.7210151271.

Adding to 171621013 its reverse (310126171), we get a palindrome (481747184).

The spelling of 171621013 in words is "one hundred seventy-one million, six hundred twenty-one thousand, thirteen".