320754991 has 2 divisors, whose sum is σ = 320754992. Its totient is φ = 320754990.

The previous prime is 320754983. The next prime is 320755073. The reversal of 320754991 is 199457023.

It is a weak prime.

It is an emirp because it is prime and its reverse (199457023) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 320754991 - 2³ = 320754983 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (320754971) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 160377495 + 160377496.

It is an arithmetic number, because the mean of its divisors is an integer number (160377496).

Almost surely, 2^320754991 is an apocalyptic number.

320754991 is a deficient number, since it is larger than the sum of its proper divisors (1).

320754991 is an equidigital number, since it uses as much as digits as its factorization.

320754991 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 68040, while the sum is 40.

The square root of 320754991 is about 17909.6340275283. The cubic root of 320754991 is about 684.5278796957.

The spelling of 320754991 in words is "three hundred twenty million, seven hundred fifty-four thousand, nine hundred ninety-one".