161240549 has 2 divisors, whose sum is σ = 161240550. Its totient is φ = 161240548.

The previous prime is 161240543. The next prime is 161240621. The reversal of 161240549 is 945042161.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 158583649 + 2656900 = 12593^2 + 1630^2 .

It is a cyclic number.

It is not a de Polignac number, because 161240549 - 2⁴ = 161240533 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 (161240543) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80620274 + 80620275.

It is an arithmetic number, because the mean of its divisors is an integer number (80620275).

Almost surely, 2^161240549 is an apocalyptic number.

It is an amenable number.

161240549 is a deficient number, since it is larger than the sum of its proper divisors (1).

161240549 is an equidigital number, since it uses as much as digits as its factorization.

161240549 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 8640, while the sum is 32.

The square root of 161240549 is about 12698.0529609858. The cubic root of 161240549 is about 544.2829826810.

The spelling of 161240549 in words is "one hundred sixty-one million, two hundred forty thousand, five hundred forty-nine".