43261881 has 24 divisors (see below), whose sum is σ = 64384320. Its totient is φ = 25685184.

The previous prime is 43261877. The next prime is 43261891. The reversal of 43261881 is 18816234.

It is not a de Polignac number, because 43261881 - 2² = 43261877 is a prime.

It is a super-2 number, since 2×43261881² = 3743180695316322, which contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (43261831) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 32140 + ... + 33458.

It is an arithmetic number, because the mean of its divisors is an integer number (2682680).

Almost surely, 2^43261881 is an apocalyptic number.

It is an amenable number.

43261881 is a deficient number, since it is larger than the sum of its proper divisors (21122439).

43261881 is a wasteful number, since it uses less digits than its factorization.

43261881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1393 (or 1364 counting only the distinct ones).

The product of its digits is 9216, while the sum is 33.

The square root of 43261881 is about 6577.3764526595. The cubic root of 43261881 is about 351.0495867477.

The spelling of 43261881 in words is "forty-three million, two hundred sixty-one thousand, eight hundred eighty-one".