8749991 has 2 divisors, whose sum is σ = 8749992. Its totient is φ = 8749990.

The previous prime is 8749981. The next prime is 8750011. The reversal of 8749991 is 1999478.

8749991 is nontrivially palindromic in base 6.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 8749991 - 2⁶ = 8749927 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (8749921) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4374995 + 4374996.

It is an arithmetic number, because the mean of its divisors is an integer number (4374996).

Almost surely, 2^8749991 is an apocalyptic number.

8749991 is a deficient number, since it is larger than the sum of its proper divisors (1).

8749991 is an equidigital number, since it uses as much as digits as its factorization.

8749991 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 163296, while the sum is 47.

The square root of 8749991 is about 2958.0383702718. The cubic root of 8749991 is about 206.0641943398.

The spelling of 8749991 in words is "eight million, seven hundred forty-nine thousand, nine hundred ninety-one".