291481361 has 2 divisors, whose sum is σ = 291481362. Its totient is φ = 291481360.

The previous prime is 291481339. The next prime is 291481403. The reversal of 291481361 is 163184192.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 287946961 + 3534400 = 16969^2 + 1880^2 .

It is a cyclic number.

It is not a de Polignac number, because 291481361 - 2⁶ = 291481297 is a prime.

It is a super-2 number, since 2×291481361² = 169922767620824642, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (291481661) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 145740680 + 145740681.

It is an arithmetic number, because the mean of its divisors is an integer number (145740681).

Almost surely, 2^291481361 is an apocalyptic number.

It is an amenable number.

291481361 is a deficient number, since it is larger than the sum of its proper divisors (1).

291481361 is an equidigital number, since it uses as much as digits as its factorization.

291481361 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 10368, while the sum is 35.

The square root of 291481361 is about 17072.8252202147. The cubic root of 291481361 is about 663.0357254958.

The spelling of 291481361 in words is "two hundred ninety-one million, four hundred eighty-one thousand, three hundred sixty-one".