8861391 has 48 divisors (see below), whose sum is σ = 16823040. Its totient is φ = 4354560.

The previous prime is 8861383. The next prime is 8861393. The reversal of 8861391 is 1931688.

8861391 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 8861391 - 2³ = 8861383 is a prime.

8861391 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8861393) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 12831 + ... + 13503.

It is an arithmetic number, because the mean of its divisors is an integer number (350480).

Almost surely, 2^8861391 is an apocalyptic number.

8861391 is a deficient number, since it is larger than the sum of its proper divisors (7961649).

8861391 is a wasteful number, since it uses less digits than its factorization.

8861391 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 716 (or 713 counting only the distinct ones).

The product of its digits is 10368, while the sum is 36.

The square root of 8861391 is about 2976.8088618519. The cubic root of 8861391 is about 206.9350072513.

The spelling of 8861391 in words is "eight million, eight hundred sixty-one thousand, three hundred ninety-one".