161490943 has 2 divisors, whose sum is σ = 161490944. Its totient is φ = 161490942.

The previous prime is 161490941. The next prime is 161490949. The reversal of 161490943 is 349094161.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 161490943 - 2¹ = 161490941 is a prime.

Together with 161490941, it forms a pair of twin primes.

It is an alternating number because its digits alternate between odd and even.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (161490941) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80745471 + 80745472.

It is an arithmetic number, because the mean of its divisors is an integer number (80745472).

Almost surely, 2^161490943 is an apocalyptic number.

161490943 is a deficient number, since it is larger than the sum of its proper divisors (1).

161490943 is an equidigital number, since it uses as much as digits as its factorization.

161490943 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 23328, while the sum is 37.

The square root of 161490943 is about 12707.9086792438. The cubic root of 161490943 is about 544.5645799758.

The spelling of 161490943 in words is "one hundred sixty-one million, four hundred ninety thousand, nine hundred forty-three".