7698991 has 2 divisors, whose sum is σ = 7698992. Its totient is φ = 7698990.

The previous prime is 7698973. The next prime is 7699057. The reversal of 7698991 is 1998967.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 7698991 - 2⁷ = 7698863 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (7698931) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3849495 + 3849496.

It is an arithmetic number, because the mean of its divisors is an integer number (3849496).

Almost surely, 2^7698991 is an apocalyptic number.

7698991 is a deficient number, since it is larger than the sum of its proper divisors (1).

7698991 is an equidigital number, since it uses as much as digits as its factorization.

7698991 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 244944, while the sum is 49.

The square root of 7698991 is about 2774.7055699659. The cubic root of 7698991 is about 197.4594565070.

The spelling of 7698991 in words is "seven million, six hundred ninety-eight thousand, nine hundred ninety-one".