290856081 has 4 divisors (see below), whose sum is σ = 387808112. Its totient is φ = 193904052.

The previous prime is 290856061. The next prime is 290856121. The reversal of 290856081 is 180658092.

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 not a de Polignac number, because 290856081 - 2¹³ = 290847889 is a prime.

It is a super-2 number, since 2×290856081² = 169194519709357122, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (290856031) 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, 48476011 + ... + 48476016.

It is an arithmetic number, because the mean of its divisors is an integer number (96952028).

Almost surely, 2^290856081 is an apocalyptic number.

It is an amenable number.

290856081 is a deficient number, since it is larger than the sum of its proper divisors (96952031).

290856081 is an equidigital number, since it uses as much as digits as its factorization.

290856081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 96952030.

The product of its (nonzero) digits is 34560, while the sum is 39.

The square root of 290856081 is about 17054.5032469433. The cubic root of 290856081 is about 662.5612757373.

The spelling of 290856081 in words is "two hundred ninety million, eight hundred fifty-six thousand, eighty-one".