264220991 has 2 divisors, whose sum is σ = 264220992. Its totient is φ = 264220990.

The previous prime is 264220937. The next prime is 264220993. The reversal of 264220991 is 199022462.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 264220991 - 2¹⁴ = 264204607 is a prime.

Together with 264220993, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (264220993) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 132110495 + 132110496.

It is an arithmetic number, because the mean of its divisors is an integer number (132110496).

Almost surely, 2^264220991 is an apocalyptic number.

264220991 is a deficient number, since it is larger than the sum of its proper divisors (1).

264220991 is an equidigital number, since it uses as much as digits as its factorization.

264220991 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 15552, while the sum is 35.

The square root of 264220991 is about 16254.8759146294. The cubic root of 264220991 is about 641.6858151217.

The spelling of 264220991 in words is "two hundred sixty-four million, two hundred twenty thousand, nine hundred ninety-one".