161405093 has 2 divisors, whose sum is σ = 161405094. Its totient is φ = 161405092.

The previous prime is 161405071. The next prime is 161405143. The reversal of 161405093 is 390504161.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 96393124 + 65011969 = 9818^2 + 8063^2 .

It is a cyclic number.

It is not a de Polignac number, because 161405093 - 2⁶ = 161405029 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (161405033) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80702546 + 80702547.

It is an arithmetic number, because the mean of its divisors is an integer number (80702547).

Almost surely, 2^161405093 is an apocalyptic number.

It is an amenable number.

161405093 is a deficient number, since it is larger than the sum of its proper divisors (1).

161405093 is an equidigital number, since it uses as much as digits as its factorization.

161405093 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3240, while the sum is 29.

The square root of 161405093 is about 12704.5304124159. The cubic root of 161405093 is about 544.4680644372.

The spelling of 161405093 in words is "one hundred sixty-one million, four hundred five thousand, ninety-three".