171620149 has 2 divisors, whose sum is σ = 171620150. Its totient is φ = 171620148.

The previous prime is 171620129. The next prime is 171620161. The reversal of 171620149 is 941026171.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 164096100 + 7524049 = 12810^2 + 2743^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-171620149 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 171620149.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (171620129) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 85810074 + 85810075.

It is an arithmetic number, because the mean of its divisors is an integer number (85810075).

Almost surely, 2^171620149 is an apocalyptic number.

It is an amenable number.

171620149 is a deficient number, since it is larger than the sum of its proper divisors (1).

171620149 is an equidigital number, since it uses as much as digits as its factorization.

171620149 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3024, while the sum is 31.

The square root of 171620149 is about 13100.3873606852. The cubic root of 171620149 is about 555.7200825611.

The spelling of 171620149 in words is "one hundred seventy-one million, six hundred twenty thousand, one hundred forty-nine".