9890104991 has 4 divisors (see below), whose sum is σ = 10650882312. Its totient is φ = 9129327672.

The previous prime is 9890104981. The next prime is 9890105003. The reversal of 9890104991 is 1994010989.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 9890104991 - 2⁶ = 9890104927 is a prime.

It is a super-2 number, since 2×9890104991² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9890104981) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 380388641 + ... + 380388666.

It is an arithmetic number, because the mean of its divisors is an integer number (2662720578).

Almost surely, 2^9890104991 is an apocalyptic number.

9890104991 is a deficient number, since it is larger than the sum of its proper divisors (760777321).

9890104991 is a wasteful number, since it uses less digits than its factorization.

9890104991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 760777320.

The product of its (nonzero) digits is 209952, while the sum is 50.

The square root of 9890104991 is about 99449.0069885064. The cubic root of 9890104991 is about 2146.5135483254.

The spelling of 9890104991 in words is "nine billion, eight hundred ninety million, one hundred four thousand, nine hundred ninety-one".