291461761 has 2 divisors, whose sum is σ = 291461762. Its totient is φ = 291461760.

The previous prime is 291461759. The next prime is 291461777. The reversal of 291461761 is 167164192.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 289000000 + 2461761 = 17000^2 + 1569^2 .

It is a cyclic number.

It is not a de Polignac number, because 291461761 - 2¹ = 291461759 is a prime.

It is a super-2 number, since 2×291461761² = 169899916250442242, which contains 22 as substring.

Together with 291461759, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 291461761.

It is not a weakly prime, because it can be changed into another prime (291461791) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 145730880 + 145730881.

It is an arithmetic number, because the mean of its divisors is an integer number (145730881).

Almost surely, 2^291461761 is an apocalyptic number.

It is an amenable number.

291461761 is a deficient number, since it is larger than the sum of its proper divisors (1).

291461761 is an equidigital number, since it uses as much as digits as its factorization.

291461761 is an evil number, because the sum of its binary digits is even.

The product of its digits is 18144, while the sum is 37.

The square root of 291461761 is about 17072.2511989485. The cubic root of 291461761 is about 663.0208637204.

The spelling of 291461761 in words is "two hundred ninety-one million, four hundred sixty-one thousand, seven hundred sixty-one".