161917043 has 2 divisors, whose sum is σ = 161917044. Its totient is φ = 161917042.

The previous prime is 161917013. The next prime is 161917081. The reversal of 161917043 is 340719161.

161917043 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 161917043 - 2¹⁴ = 161900659 is a prime.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (161917013) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80958521 + 80958522.

It is an arithmetic number, because the mean of its divisors is an integer number (80958522).

Almost surely, 2^161917043 is an apocalyptic number.

161917043 is a deficient number, since it is larger than the sum of its proper divisors (1).

161917043 is an equidigital number, since it uses as much as digits as its factorization.

161917043 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4536, while the sum is 32.

The square root of 161917043 is about 12724.6627853158. The cubic root of 161917043 is about 545.0431108057.

The spelling of 161917043 in words is "one hundred sixty-one million, nine hundred seventeen thousand, forty-three".