171604649 has 2 divisors, whose sum is σ = 171604650. Its totient is φ = 171604648.

The previous prime is 171604597. The next prime is 171604673. The reversal of 171604649 is 946406171.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 164352400 + 7252249 = 12820^2 + 2693^2 .

It is an emirp because it is prime and its reverse (946406171) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 171604649 - 2¹⁶ = 171539113 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (171604249) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 85802324 + 85802325.

It is an arithmetic number, because the mean of its divisors is an integer number (85802325).

Almost surely, 2^171604649 is an apocalyptic number.

It is an amenable number.

171604649 is a deficient number, since it is larger than the sum of its proper divisors (1).

171604649 is an equidigital number, since it uses as much as digits as its factorization.

171604649 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 36288, while the sum is 38.

The square root of 171604649 is about 13099.7957617667. The cubic root of 171604649 is about 555.7033519681.

The spelling of 171604649 in words is "one hundred seventy-one million, six hundred four thousand, six hundred forty-nine".