9826691081 has 4 divisors (see below), whose sum is σ = 9827526912. Its totient is φ = 9825855252.

The previous prime is 9826691047. The next prime is 9826691087. The reversal of 9826691081 is 1801966289.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-9826691081 is a prime.

It is a super-2 number, since 2×9826691081² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (9826691087) 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, 400025 + ... + 423878.

It is an arithmetic number, because the mean of its divisors is an integer number (2456881728).

Almost surely, 2^9826691081 is an apocalyptic number.

It is an amenable number.

9826691081 is a deficient number, since it is larger than the sum of its proper divisors (835831).

9826691081 is a wasteful number, since it uses less digits than its factorization.

9826691081 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 835830.

The product of its (nonzero) digits is 373248, while the sum is 50.

The square root of 9826691081 is about 99129.6680161898. The cubic root of 9826691081 is about 2141.9159974561.

The spelling of 9826691081 in words is "nine billion, eight hundred twenty-six million, six hundred ninety-one thousand, eighty-one".