9423821081 has 4 divisors (see below), whose sum is σ = 9450517812. Its totient is φ = 9397124352.

The previous prime is 9423821051. The next prime is 9423821083. The reversal of 9423821081 is 1801283249.

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

It can be written as a sum of positive squares in 2 ways, for example, as 2145171856 + 7278649225 = 46316^2 + 85315^2 .

It is a cyclic number.

It is not a de Polignac number, because 9423821081 - 2¹⁰ = 9423820057 is a prime.

It is a super-2 number, since 2×9423821081² (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 (9423821083) 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, 13347836 + ... + 13348541.

It is an arithmetic number, because the mean of its divisors is an integer number (2362629453).

Almost surely, 2^9423821081 is an apocalyptic number.

It is an amenable number.

9423821081 is a deficient number, since it is larger than the sum of its proper divisors (26696731).

9423821081 is a wasteful number, since it uses less digits than its factorization.

9423821081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26696730.

The product of its (nonzero) digits is 27648, while the sum is 38.

The square root of 9423821081 is about 97076.3672630986. The cubic root of 9423821081 is about 2112.2355319213.

The spelling of 9423821081 in words is "nine billion, four hundred twenty-three million, eight hundred twenty-one thousand, eighty-one".