171942649 has 2 divisors, whose sum is σ = 171942650. Its totient is φ = 171942648.

The previous prime is 171942637. The next prime is 171942677. The reversal of 171942649 is 946249171.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 95257600 + 76685049 = 9760^2 + 8757^2 .

It is a cyclic number.

It is not a de Polignac number, because 171942649 - 2¹³ = 171934457 is a prime.

It is not a weakly prime, because it can be changed into another prime (171942629) 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, 85971324 + 85971325.

It is an arithmetic number, because the mean of its divisors is an integer number (85971325).

Almost surely, 2^171942649 is an apocalyptic number.

It is an amenable number.

171942649 is a deficient number, since it is larger than the sum of its proper divisors (1).

171942649 is an equidigital number, since it uses as much as digits as its factorization.

171942649 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 108864, while the sum is 43.

The square root of 171942649 is about 13112.6903799335. The cubic root of 171942649 is about 556.0679585428.

The spelling of 171942649 in words is "one hundred seventy-one million, nine hundred forty-two thousand, six hundred forty-nine".