161241089 has 4 divisors (see below), whose sum is σ = 161270340. Its totient is φ = 161211840.

The previous prime is 161241077. The next prime is 161241103. The reversal of 161241089 is 980142161.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 65044225 + 96196864 = 8065^2 + 9808^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-161241089 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (161241019) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3572 + ... + 18309.

It is an arithmetic number, because the mean of its divisors is an integer number (40317585).

Almost surely, 2^161241089 is an apocalyptic number.

It is an amenable number.

161241089 is a deficient number, since it is larger than the sum of its proper divisors (29251).

161241089 is an equidigital number, since it uses as much as digits as its factorization.

161241089 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29250.

The product of its (nonzero) digits is 3456, while the sum is 32.

The square root of 161241089 is about 12698.0742240704. The cubic root of 161241089 is about 544.2835902877.

The spelling of 161241089 in words is "one hundred sixty-one million, two hundred forty-one thousand, eighty-nine".