881399809 has 4 divisors (see below), whose sum is σ = 881673520. Its totient is φ = 881126100.

The previous prime is 881399801. The next prime is 881399819. The reversal of 881399809 is 908993188.

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 881399809 - 2³ = 881399801 is a prime.

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 881399809.

It is not an unprimeable number, because it can be changed into a prime (881399801) 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, 131967 + ... + 138484.

It is an arithmetic number, because the mean of its divisors is an integer number (220418380).

Almost surely, 2^881399809 is an apocalyptic number.

It is an amenable number.

881399809 is a deficient number, since it is larger than the sum of its proper divisors (273711).

881399809 is a wasteful number, since it uses less digits than its factorization.

881399809 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 273710.

The product of its (nonzero) digits is 1119744, while the sum is 55.

The square root of 881399809 is about 29688.3783491116. The cubic root of 881399809 is about 958.7918137976.

The spelling of 881399809 in words is "eight hundred eighty-one million, three hundred ninety-nine thousand, eight hundred nine".