171664631 has 2 divisors, whose sum is σ = 171664632. Its totient is φ = 171664630.

The previous prime is 171664621. The next prime is 171664637. The reversal of 171664631 is 136466171.

It is a strong prime.

It is an emirp because it is prime and its reverse (136466171) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 171664631 - 2¹⁰ = 171663607 is a prime.

It is a super-2 number, since 2×171664631² = 58937491072732322, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 171664591 and 171664600.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (171664637) 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, 85832315 + 85832316.

It is an arithmetic number, because the mean of its divisors is an integer number (85832316).

Almost surely, 2^171664631 is an apocalyptic number.

171664631 is a deficient number, since it is larger than the sum of its proper divisors (1).

171664631 is an equidigital number, since it uses as much as digits as its factorization.

171664631 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 18144, while the sum is 35.

The square root of 171664631 is about 13102.0849867492. The cubic root of 171664631 is about 555.7680905320.

The spelling of 171664631 in words is "one hundred seventy-one million, six hundred sixty-four thousand, six hundred thirty-one".