290691161 has 2 divisors, whose sum is σ = 290691162. Its totient is φ = 290691160.

The previous prime is 290691139. The next prime is 290691173. The reversal of 290691161 is 161196092.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 235039561 + 55651600 = 15331^2 + 7460^2 .

It is a cyclic number.

It is not a de Polignac number, because 290691161 - 2⁶ = 290691097 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (290691361) 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, 145345580 + 145345581.

It is an arithmetic number, because the mean of its divisors is an integer number (145345581).

Almost surely, 2^290691161 is an apocalyptic number.

It is an amenable number.

290691161 is a deficient number, since it is larger than the sum of its proper divisors (1).

290691161 is an equidigital number, since it uses as much as digits as its factorization.

290691161 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5832, while the sum is 35.

The square root of 290691161 is about 17049.6674747633. The cubic root of 290691161 is about 662.4360244856.

The spelling of 290691161 in words is "two hundred ninety million, six hundred ninety-one thousand, one hundred sixty-one".