291030989 has 2 divisors, whose sum is σ = 291030990. Its totient is φ = 291030988.

The previous prime is 291030967. The next prime is 291031019. The reversal of 291030989 is 989030192.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 186786889 + 104244100 = 13667^2 + 10210^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-291030989 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (291030919) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 145515494 + 145515495.

It is an arithmetic number, because the mean of its divisors is an integer number (145515495).

Almost surely, 2^291030989 is an apocalyptic number.

It is an amenable number.

291030989 is a deficient number, since it is larger than the sum of its proper divisors (1).

291030989 is an equidigital number, since it uses as much as digits as its factorization.

291030989 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 34992, while the sum is 41.

The square root of 291030989 is about 17059.6303887277. The cubic root of 291030989 is about 662.6940608192.

The spelling of 291030989 in words is "two hundred ninety-one million, thirty thousand, nine hundred eighty-nine".