19098991 has 2 divisors, whose sum is σ = 19098992. Its totient is φ = 19098990.

The previous prime is 19098983. The next prime is 19098997. The reversal of 19098991 is 19989091.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 19098991 - 2³ = 19098983 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (19098997) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9549495 + 9549496.

It is an arithmetic number, because the mean of its divisors is an integer number (9549496).

Almost surely, 2^19098991 is an apocalyptic number.

19098991 is a deficient number, since it is larger than the sum of its proper divisors (1).

19098991 is an equidigital number, since it uses as much as digits as its factorization.

19098991 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 52488, while the sum is 46.

The square root of 19098991 is about 4370.2392383026. The cubic root of 19098991 is about 267.3027794855.

The spelling of 19098991 in words is "nineteen million, ninety-eight thousand, nine hundred ninety-one".