290945491 has 2 divisors, whose sum is σ = 290945492. Its totient is φ = 290945490.

The previous prime is 290945449. The next prime is 290945503. The reversal of 290945491 is 194549092.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 290945491 - 2¹⁹ = 290421203 is a prime.

It is not a weakly prime, because it can be changed into another prime (290945411) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 145472745 + 145472746.

It is an arithmetic number, because the mean of its divisors is an integer number (145472746).

Almost surely, 2^290945491 is an apocalyptic number.

290945491 is a deficient number, since it is larger than the sum of its proper divisors (1).

290945491 is an equidigital number, since it uses as much as digits as its factorization.

290945491 is an odious number, because the sum of its binary digits is odd.

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

The square root of 290945491 is about 17057.1243473219. The cubic root of 290945491 is about 662.6291598656.

It can be divided in two parts, 2909 and 45491, that added together give a square (48400 = 220²).

The spelling of 290945491 in words is "two hundred ninety million, nine hundred forty-five thousand, four hundred ninety-one".