291148243 has 2 divisors, whose sum is σ = 291148244. Its totient is φ = 291148242.

The previous prime is 291148241. The next prime is 291148271. The reversal of 291148243 is 342841192.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 291148243 - 2¹ = 291148241 is a prime.

Together with 291148241, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 291148199 and 291148208.

It is not a weakly prime, because it can be changed into another prime (291148241) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 145574121 + 145574122.

It is an arithmetic number, because the mean of its divisors is an integer number (145574122).

Almost surely, 2^291148243 is an apocalyptic number.

291148243 is a deficient number, since it is larger than the sum of its proper divisors (1).

291148243 is an equidigital number, since it uses as much as digits as its factorization.

291148243 is an evil number, because the sum of its binary digits is even.

The product of its digits is 13824, while the sum is 34.

The square root of 291148243 is about 17063.0666352798. The cubic root of 291148243 is about 662.7830468714.

The spelling of 291148243 in words is "two hundred ninety-one million, one hundred forty-eight thousand, two hundred forty-three".