171270661 has 2 divisors, whose sum is σ = 171270662. Its totient is φ = 171270660.

The previous prime is 171270647. The next prime is 171270667. The reversal of 171270661 is 166072171.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 161442436 + 9828225 = 12706^2 + 3135^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-171270661 is a prime.

It is a Chen prime.

It is equal to p_9570271 and since 171270661 and 9570271 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (171270667) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 85635330 + 85635331.

It is an arithmetic number, because the mean of its divisors is an integer number (85635331).

Almost surely, 2^171270661 is an apocalyptic number.

It is an amenable number.

171270661 is a deficient number, since it is larger than the sum of its proper divisors (1).

171270661 is an equidigital number, since it uses as much as digits as its factorization.

171270661 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3528, while the sum is 31.

The square root of 171270661 is about 13087.0417207251. The cubic root of 171270661 is about 555.3426026327.

The spelling of 171270661 in words is "one hundred seventy-one million, two hundred seventy thousand, six hundred sixty-one".