9090919281 has 4 divisors (see below), whose sum is σ = 12121225712. Its totient is φ = 6060612852.

The previous prime is 9090919273. The next prime is 9090919297. The reversal of 9090919281 is 1829190909.

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 not a de Polignac number, because 9090919281 - 2³ = 9090919273 is a prime.

It is a super-2 number, since 2×9090919281² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 9090919281.

It is not an unprimeable number, because it can be changed into a prime (9090919781) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1515153211 + ... + 1515153216.

It is an arithmetic number, because the mean of its divisors is an integer number (3030306428).

Almost surely, 2^9090919281 is an apocalyptic number.

It is an amenable number.

9090919281 is a deficient number, since it is larger than the sum of its proper divisors (3030306431).

9090919281 is a wasteful number, since it uses less digits than its factorization.

9090919281 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3030306430.

The product of its (nonzero) digits is 104976, while the sum is 48.

The square root of 9090919281 is about 95346.3123618318. The cubic root of 9090919281 is about 2087.0648022266.

The spelling of 9090919281 in words is "nine billion, ninety million, nine hundred nineteen thousand, two hundred eighty-one".