171649013 has 2 divisors, whose sum is σ = 171649014. Its totient is φ = 171649012.

The previous prime is 171648959. The next prime is 171649073. The reversal of 171649013 is 310946171.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 115068529 + 56580484 = 10727^2 + 7522^2 .

It is a cyclic number.

It is not a de Polignac number, because 171649013 - 2²⁴ = 154871797 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (171649073) 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 as a sum of consecutive naturals, namely, 85824506 + 85824507.

It is an arithmetic number, because the mean of its divisors is an integer number (85824507).

Almost surely, 2^171649013 is an apocalyptic number.

It is an amenable number.

171649013 is a deficient number, since it is larger than the sum of its proper divisors (1).

171649013 is an equidigital number, since it uses as much as digits as its factorization.

171649013 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4536, while the sum is 32.

The square root of 171649013 is about 13101.4889611830. The cubic root of 171649013 is about 555.7512354791.

The spelling of 171649013 in words is "one hundred seventy-one million, six hundred forty-nine thousand, thirteen".