161293291 has 2 divisors, whose sum is σ = 161293292. Its totient is φ = 161293290.

The previous prime is 161293247. The next prime is 161293339. The reversal of 161293291 is 192392161.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-161293291 is a prime.

It is a super-2 number, since 2×161293291² = 52031051443221362, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (161293201) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80646645 + 80646646.

It is an arithmetic number, because the mean of its divisors is an integer number (80646646).

Almost surely, 2^161293291 is an apocalyptic number.

161293291 is a deficient number, since it is larger than the sum of its proper divisors (1).

161293291 is an equidigital number, since it uses as much as digits as its factorization.

161293291 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5832, while the sum is 34.

The square root of 161293291 is about 12700.1295662682. The cubic root of 161293291 is about 544.3423214430.

The spelling of 161293291 in words is "one hundred sixty-one million, two hundred ninety-three thousand, two hundred ninety-one".