67098991 has 2 divisors, whose sum is σ = 67098992. Its totient is φ = 67098990.

The previous prime is 67098971. The next prime is 67099031. The reversal of 67098991 is 19989076.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 67098991 - 2¹⁷ = 66967919 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (67098931) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33549495 + 33549496.

It is an arithmetic number, because the mean of its divisors is an integer number (33549496).

Almost surely, 2^67098991 is an apocalyptic number.

67098991 is a deficient number, since it is larger than the sum of its proper divisors (1).

67098991 is an equidigital number, since it uses as much as digits as its factorization.

67098991 is an odious number, because the sum of its binary digits is odd.

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

The square root of 67098991 is about 8191.3973777372. The cubic root of 67098991 is about 406.3547398259.

The spelling of 67098991 in words is "sixty-seven million, ninety-eight thousand, nine hundred ninety-one".