9862991 has 4 divisors (see below), whose sum is σ = 10181184. Its totient is φ = 9544800.

The previous prime is 9862981. The next prime is 9862999. The reversal of 9862991 is 1992689.

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 9862991 - 2⁶ = 9862927 is a prime.

It is a Duffinian number.

It is a plaindrome in base 12.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9862999) 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, 159050 + ... + 159111.

It is an arithmetic number, because the mean of its divisors is an integer number (2545296).

Almost surely, 2^9862991 is an apocalyptic number.

9862991 is a deficient number, since it is larger than the sum of its proper divisors (318193).

9862991 is a wasteful number, since it uses less digits than its factorization.

9862991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 318192.

The product of its digits is 69984, while the sum is 44.

The square root of 9862991 is about 3140.5399217332. The cubic root of 9862991 is about 214.4550177988.

The spelling of 9862991 in words is "nine million, eight hundred sixty-two thousand, nine hundred ninety-one".