291419621 has 2 divisors, whose sum is σ = 291419622. Its totient is φ = 291419620.

The previous prime is 291419567. The next prime is 291419633. The reversal of 291419621 is 126914192.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 167987521 + 123432100 = 12961^2 + 11110^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-291419621 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (291419671) 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, 145709810 + 145709811.

It is an arithmetic number, because the mean of its divisors is an integer number (145709811).

Almost surely, 2^291419621 is an apocalyptic number.

It is an amenable number.

291419621 is a deficient number, since it is larger than the sum of its proper divisors (1).

291419621 is an equidigital number, since it uses as much as digits as its factorization.

291419621 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 7776, while the sum is 35.

The square root of 291419621 is about 17071.0169878657. The cubic root of 291419621 is about 662.9889086471.

The spelling of 291419621 in words is "two hundred ninety-one million, four hundred nineteen thousand, six hundred twenty-one".