10091989 has 2 divisors, whose sum is σ = 10091990. Its totient is φ = 10091988.

The previous prime is 10091987. The next prime is 10091993. The reversal of 10091989 is 98919001.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 9972964 + 119025 = 3158^2 + 345^2 .

It is a cyclic number.

It is not a de Polignac number, because 10091989 - 2¹ = 10091987 is a prime.

It is a super-2 number, since 2×10091989² = 203696483952242, which contains 22 as substring.

Together with 10091987, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (10091987) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5045994 + 5045995.

It is an arithmetic number, because the mean of its divisors is an integer number (5045995).

Almost surely, 2^10091989 is an apocalyptic number.

It is an amenable number.

10091989 is a deficient number, since it is larger than the sum of its proper divisors (1).

10091989 is an equidigital number, since it uses as much as digits as its factorization.

10091989 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5832, while the sum is 37.

The square root of 10091989 is about 3176.7891022226. The cubic root of 10091989 is about 216.1020679595.

The spelling of 10091989 in words is "ten million, ninety-one thousand, nine hundred eighty-nine".