161291671 has 2 divisors, whose sum is σ = 161291672. Its totient is φ = 161291670.

The previous prime is 161291657. The next prime is 161291681. The reversal of 161291671 is 176192161.

It is a strong prime.

It is an emirp because it is prime and its reverse (176192161) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-161291671 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (161291681) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80645835 + 80645836.

It is an arithmetic number, because the mean of its divisors is an integer number (80645836).

Almost surely, 2^161291671 is an apocalyptic number.

161291671 is a deficient number, since it is larger than the sum of its proper divisors (1).

161291671 is an equidigital number, since it uses as much as digits as its factorization.

161291671 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4536, while the sum is 34.

The square root of 161291671 is about 12700.0657872312. The cubic root of 161291671 is about 544.3404990123.

The spelling of 161291671 in words is "one hundred sixty-one million, two hundred ninety-one thousand, six hundred seventy-one".