290240161 has 4 divisors (see below), whose sum is σ = 292808772. Its totient is φ = 287671552.

The previous prime is 290240147. The next prime is 290240213. The reversal of 290240161 is 161042092.

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 30869136 + 259371025 = 5556^2 + 16105^2 .

It is a cyclic number.

It is not a de Polignac number, because 290240161 - 2⁵ = 290240129 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (290240101) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1284136 + ... + 1284361.

It is an arithmetic number, because the mean of its divisors is an integer number (73202193).

Almost surely, 2^290240161 is an apocalyptic number.

It is an amenable number.

290240161 is a deficient number, since it is larger than the sum of its proper divisors (2568611).

290240161 is a wasteful number, since it uses less digits than its factorization.

290240161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2568610.

The product of its (nonzero) digits is 864, while the sum is 25.

The square root of 290240161 is about 17036.4362764048. The cubic root of 290240161 is about 662.0932629045.

The spelling of 290240161 in words is "two hundred ninety million, two hundred forty thousand, one hundred sixty-one".