807949991 has 2 divisors, whose sum is σ = 807949992. Its totient is φ = 807949990.

The previous prime is 807949979. The next prime is 807950009. The reversal of 807949991 is 199949708.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 807949991 - 2¹⁸ = 807687847 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (807949391) 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 as a sum of consecutive naturals, namely, 403974995 + 403974996.

It is an arithmetic number, because the mean of its divisors is an integer number (403974996).

Almost surely, 2^807949991 is an apocalyptic number.

807949991 is a deficient number, since it is larger than the sum of its proper divisors (1).

807949991 is an equidigital number, since it uses as much as digits as its factorization.

807949991 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1469664, while the sum is 56.

The square root of 807949991 is about 28424.4611382520. The cubic root of 807949991 is about 931.3826856207.

The spelling of 807949991 in words is "eight hundred seven million, nine hundred forty-nine thousand, nine hundred ninety-one".