291120231 has 4 divisors (see below), whose sum is σ = 388160312. Its totient is φ = 194080152.

The previous prime is 291120229. The next prime is 291120239. The reversal of 291120231 is 132021192.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 291120231 - 2¹ = 291120229 is a prime.

It is a super-2 number, since 2×291120231² = 169501977794986722, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 291120198 and 291120207.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (291120239) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 48520036 + ... + 48520041.

It is an arithmetic number, because the mean of its divisors is an integer number (97040078).

Almost surely, 2^291120231 is an apocalyptic number.

291120231 is a deficient number, since it is larger than the sum of its proper divisors (97040081).

291120231 is an equidigital number, since it uses as much as digits as its factorization.

291120231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 97040080.

The product of its (nonzero) digits is 216, while the sum is 21.

The square root of 291120231 is about 17062.2457783259. The cubic root of 291120231 is about 662.7617902612.

The spelling of 291120231 in words is "two hundred ninety-one million, one hundred twenty thousand, two hundred thirty-one".