290891399 has 2 divisors, whose sum is σ = 290891400. Its totient is φ = 290891398.

The previous prime is 290891353. The next prime is 290891407. The reversal of 290891399 is 993198092.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 290891399 - 2¹⁶ = 290825863 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (290891099) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 145445699 + 145445700.

It is an arithmetic number, because the mean of its divisors is an integer number (145445700).

Almost surely, 2^290891399 is an apocalyptic number.

290891399 is a deficient number, since it is larger than the sum of its proper divisors (1).

290891399 is an equidigital number, since it uses as much as digits as its factorization.

290891399 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 314928, while the sum is 50.

The square root of 290891399 is about 17055.5386605056. The cubic root of 290891399 is about 662.5880924273.

The spelling of 290891399 in words is "two hundred ninety million, eight hundred ninety-one thousand, three hundred ninety-nine".