307920997 has 2 divisors, whose sum is σ = 307920998. Its totient is φ = 307920996.

The previous prime is 307920959. The next prime is 307921021. The reversal of 307920997 is 799029703.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 258373476 + 49547521 = 16074^2 + 7039^2 .

It is a cyclic number.

It is not a de Polignac number, because 307920997 - 2¹⁹ = 307396709 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (307900997) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 153960498 + 153960499.

It is an arithmetic number, because the mean of its divisors is an integer number (153960499).

Almost surely, 2^307920997 is an apocalyptic number.

It is an amenable number.

307920997 is a deficient number, since it is larger than the sum of its proper divisors (1).

307920997 is an equidigital number, since it uses as much as digits as its factorization.

307920997 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 214326, while the sum is 46.

The square root of 307920997 is about 17547.6778235754. The cubic root of 307920997 is about 675.2735951711.

The spelling of 307920997 in words is "three hundred seven million, nine hundred twenty thousand, nine hundred ninety-seven".