890809081 has 4 divisors (see below), whose sum is σ = 905907600. Its totient is φ = 875710564.

The previous prime is 890809079. The next prime is 890809093. The reversal of 890809081 is 180908098.

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 not a de Polignac number, because 890809081 - 2¹ = 890809079 is a prime.

It is a super-2 number, since 2×890809081² = 1587081637584129122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (890809981) 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, 7549171 + ... + 7549288.

It is an arithmetic number, because the mean of its divisors is an integer number (226476900).

Almost surely, 2^890809081 is an apocalyptic number.

It is an amenable number.

890809081 is a deficient number, since it is larger than the sum of its proper divisors (15098519).

890809081 is a wasteful number, since it uses less digits than its factorization.

890809081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15098518.

The product of its (nonzero) digits is 41472, while the sum is 43.

The square root of 890809081 is about 29846.4249282892. The cubic root of 890809081 is about 962.1915646563.

The spelling of 890809081 in words is "eight hundred ninety million, eight hundred nine thousand, eighty-one".