320451997 has 2 divisors, whose sum is σ = 320451998. Its totient is φ = 320451996.

The previous prime is 320451977. The next prime is 320452003. The reversal of 320451997 is 799154023.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 165225316 + 155226681 = 12854^2 + 12459^2 .

It is a cyclic number.

It is not a de Polignac number, because 320451997 - 2⁷ = 320451869 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (320451947) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 160225998 + 160225999.

It is an arithmetic number, because the mean of its divisors is an integer number (160225999).

Almost surely, 2^320451997 is an apocalyptic number.

It is an amenable number.

320451997 is a deficient number, since it is larger than the sum of its proper divisors (1).

320451997 is an equidigital number, since it uses as much as digits as its factorization.

320451997 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 320451997 is about 17901.1730621208. The cubic root of 320451997 is about 684.3122704943.

The spelling of 320451997 in words is "three hundred twenty million, four hundred fifty-one thousand, nine hundred ninety-seven".