171612111149 has 2 divisors, whose sum is σ = 171612111150. Its totient is φ = 171612111148.

The previous prime is 171612111079. The next prime is 171612111157. The reversal of 171612111149 is 941111216171.

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., 118228008649 + 53384102500 = 343843^2 + 231050^2 .

It is a cyclic number.

It is not a de Polignac number, because 171612111149 - 2⁸ = 171612110893 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (171612111199) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 85806055574 + 85806055575.

It is an arithmetic number, because the mean of its divisors is an integer number (85806055575).

Almost surely, 2^171612111149 is an apocalyptic number.

It is an amenable number.

171612111149 is a deficient number, since it is larger than the sum of its proper divisors (1).

171612111149 is an equidigital number, since it uses as much as digits as its factorization.

171612111149 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3024, while the sum is 35.

The spelling of 171612111149 in words is "one hundred seventy-one billion, six hundred twelve million, one hundred eleven thousand, one hundred forty-nine".