291480491 has 2 divisors, whose sum is σ = 291480492. Its totient is φ = 291480490.

The previous prime is 291480481. The next prime is 291480493. The reversal of 291480491 is 194084192.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 291480491 - 2²² = 287286187 is a prime.

Together with 291480493, it forms a pair of twin primes.

It is a Chen prime.

It is equal to p_15815495 and since 291480491 and 15815495 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (291480493) 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, 145740245 + 145740246.

It is an arithmetic number, because the mean of its divisors is an integer number (145740246).

Almost surely, 2^291480491 is an apocalyptic number.

291480491 is a deficient number, since it is larger than the sum of its proper divisors (1).

291480491 is an equidigital number, since it uses as much as digits as its factorization.

291480491 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 20736, while the sum is 38.

The square root of 291480491 is about 17072.7997411087. The cubic root of 291480491 is about 663.0350658291.

The spelling of 291480491 in words is "two hundred ninety-one million, four hundred eighty thousand, four hundred ninety-one".