9209806081 has 4 divisors (see below), whose sum is σ = 10525492672. Its totient is φ = 7894119492.

The previous prime is 9209806069. The next prime is 9209806093. The reversal of 9209806081 is 1806089029.

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 an interprime number because it is at equal distance from previous prime (9209806069) and next prime (9209806093).

It is not a de Polignac number, because 9209806081 - 2⁹ = 9209805569 is a prime.

It is a super-2 number, since 2×9209806081² (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 (9209806061) 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, 657843285 + ... + 657843298.

It is an arithmetic number, because the mean of its divisors is an integer number (2631373168).

Almost surely, 2^9209806081 is an apocalyptic number.

It is an amenable number.

9209806081 is a deficient number, since it is larger than the sum of its proper divisors (1315686591).

9209806081 is a wasteful number, since it uses less digits than its factorization.

9209806081 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1315686590.

The product of its (nonzero) digits is 62208, while the sum is 43.

The square root of 9209806081 is about 95967.7345830358. The cubic root of 9209806081 is about 2096.1233150824.

The spelling of 9209806081 in words is "nine billion, two hundred nine million, eight hundred six thousand, eighty-one".