165801941 has 2 divisors, whose sum is σ = 165801942. Its totient is φ = 165801940.

The previous prime is 165801913. The next prime is 165801953. The reversal of 165801941 is 149108561.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 159921316 + 5880625 = 12646^2 + 2425^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-165801941 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (165801341) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 82900970 + 82900971.

It is an arithmetic number, because the mean of its divisors is an integer number (82900971).

Almost surely, 2^165801941 is an apocalyptic number.

It is an amenable number.

165801941 is a deficient number, since it is larger than the sum of its proper divisors (1).

165801941 is an equidigital number, since it uses as much as digits as its factorization.

165801941 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 8640, while the sum is 35.

The square root of 165801941 is about 12876.4102528616. The cubic root of 165801941 is about 549.3678036292.

The spelling of 165801941 in words is "one hundred sixty-five million, eight hundred one thousand, nine hundred forty-one".