881091861 has 32 divisors (see below), whose sum is σ = 1345051008. Its totient is φ = 508231680.

The previous prime is 881091859. The next prime is 881091863. The reversal of 881091861 is 168190188.

It is an interprime number because it is at equal distance from previous prime (881091859) and next prime (881091863).

It is not a de Polignac number, because 881091861 - 2¹ = 881091859 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (881091863) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 167806 + ... + 172976.

It is an arithmetic number, because the mean of its divisors is an integer number (42032844).

Almost surely, 2^881091861 is an apocalyptic number.

It is an amenable number.

881091861 is a deficient number, since it is larger than the sum of its proper divisors (463959147).

881091861 is a wasteful number, since it uses less digits than its factorization.

881091861 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5461.

The product of its (nonzero) digits is 27648, while the sum is 42.

The square root of 881091861 is about 29683.1915568390. The cubic root of 881091861 is about 958.6801382517.

The spelling of 881091861 in words is "eight hundred eighty-one million, ninety-one thousand, eight hundred sixty-one".