290342261 has 4 divisors (see below), whose sum is σ = 316737024. Its totient is φ = 263947500.

The previous prime is 290342231. The next prime is 290342263. The reversal of 290342261 is 162243092.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-290342261 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (290342263) 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, 13197365 + ... + 13197386.

It is an arithmetic number, because the mean of its divisors is an integer number (79184256).

Almost surely, 2^290342261 is an apocalyptic number.

It is an amenable number.

290342261 is a deficient number, since it is larger than the sum of its proper divisors (26394763).

290342261 is a wasteful number, since it uses less digits than its factorization.

290342261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26394762.

The product of its (nonzero) digits is 5184, while the sum is 29.

The square root of 290342261 is about 17039.4325316309. The cubic root of 290342261 is about 662.1708903387.

The spelling of 290342261 in words is "two hundred ninety million, three hundred forty-two thousand, two hundred sixty-one".