8149991 has 2 divisors, whose sum is σ = 8149992. Its totient is φ = 8149990.

The previous prime is 8149979. The next prime is 8150011. The reversal of 8149991 is 1999418.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 8149991 - 2⁶ = 8149927 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (8149901) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4074995 + 4074996.

It is an arithmetic number, because the mean of its divisors is an integer number (4074996).

Almost surely, 2^8149991 is an apocalyptic number.

8149991 is a deficient number, since it is larger than the sum of its proper divisors (1).

8149991 is an equidigital number, since it uses as much as digits as its factorization.

8149991 is an evil number, because the sum of its binary digits is even.

The product of its digits is 23328, while the sum is 41.

The square root of 8149991 is about 2854.8189084424. The cubic root of 8149991 is about 201.2421937998.

The spelling of 8149991 in words is "eight million, one hundred forty-nine thousand, nine hundred ninety-one".