290825861 has 2 divisors, whose sum is σ = 290825862. Its totient is φ = 290825860.

The previous prime is 290825789. The next prime is 290825863. The reversal of 290825861 is 168528092.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 269156836 + 21669025 = 16406^2 + 4655^2 .

It is a cyclic number.

It is not a de Polignac number, because 290825861 - 2¹⁸ = 290563717 is a prime.

Together with 290825863, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (290825863) 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 as a sum of consecutive naturals, namely, 145412930 + 145412931.

It is an arithmetic number, because the mean of its divisors is an integer number (145412931).

Almost surely, 2^290825861 is an apocalyptic number.

It is an amenable number.

290825861 is a deficient number, since it is larger than the sum of its proper divisors (1).

290825861 is an equidigital number, since it uses as much as digits as its factorization.

290825861 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 69120, while the sum is 41.

The square root of 290825861 is about 17053.6172409258. The cubic root of 290825861 is about 662.5383281967.

It can be divided in two parts, 29082 and 5861, that added together give a palindrome (34943).

The spelling of 290825861 in words is "two hundred ninety million, eight hundred twenty-five thousand, eight hundred sixty-one".