881869409 has 2 divisors, whose sum is σ = 881869410. Its totient is φ = 881869408.

The previous prime is 881869399. The next prime is 881869447. The reversal of 881869409 is 904968188.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 727488784 + 154380625 = 26972^2 + 12425^2 .

It is a cyclic number.

It is not a de Polignac number, because 881869409 - 2⁴ = 881869393 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (881869459) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 440934704 + 440934705.

It is an arithmetic number, because the mean of its divisors is an integer number (440934705).

Almost surely, 2^881869409 is an apocalyptic number.

It is an amenable number.

881869409 is a deficient number, since it is larger than the sum of its proper divisors (1).

881869409 is an equidigital number, since it uses as much as digits as its factorization.

881869409 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 995328, while the sum is 53.

The square root of 881869409 is about 29696.2861145969. The cubic root of 881869409 is about 958.9620614318.

The spelling of 881869409 in words is "eight hundred eighty-one million, eight hundred sixty-nine thousand, four hundred nine".