290395681 has 3 divisors (see below), whose sum is σ = 290412723. Its totient is φ = 290378640.

The previous prime is 290395673. The next prime is 290395687. The reversal of 290395681 is 186593092.

It is a happy number.

The square root of 290395681 is 17041.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in only one way, i.e., 263770081 + 26625600 = 16241^2 + 5160^2 .

It is not a de Polignac number, because 290395681 - 2³ = 290395673 is a prime.

It is a super-2 number, since 2×290395681² = 168659303086907522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (290395687) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 8521 + ... + 25561.

It is an arithmetic number, because the mean of its divisors is an integer number (96804241).

Almost surely, 2^290395681 is an apocalyptic number.

290395681 is the 17041-st square number.

290395681 is the 8521-st centered octagonal number.

It is an amenable number.

290395681 is a deficient number, since it is larger than the sum of its proper divisors (17042).

290395681 is an frugal number, since it uses more digits than its factorization.

290395681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34082 (or 17041 counting only the distinct ones).

The product of its (nonzero) digits is 116640, while the sum is 43.

The cubic root of 290395681 is about 662.2114987339.

The spelling of 290395681 in words is "two hundred ninety million, three hundred ninety-five thousand, six hundred eighty-one".