890749991 has 2 divisors, whose sum is σ = 890749992. Its totient is φ = 890749990.

The previous prime is 890749987. The next prime is 890750011. The reversal of 890749991 is 199947098.

890749991 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 890749991 - 2² = 890749987 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (890749931) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 445374995 + 445374996.

It is an arithmetic number, because the mean of its divisors is an integer number (445374996).

Almost surely, 2^890749991 is an apocalyptic number.

890749991 is a deficient number, since it is larger than the sum of its proper divisors (1).

890749991 is an equidigital number, since it uses as much as digits as its factorization.

890749991 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1469664, while the sum is 56.

The square root of 890749991 is about 29845.4350110700. The cubic root of 890749991 is about 962.1702891822.

The spelling of 890749991 in words is "eight hundred ninety million, seven hundred forty-nine thousand, nine hundred ninety-one".