1091881 has 8 divisors (see below), whose sum is σ = 1257344. Its totient is φ = 928800.

The previous prime is 1091869. The next prime is 1091887. The reversal of 1091881 is 1881901.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1091881 - 2⁹ = 1091369 is a prime.

It is a super-2 number, since 2×1091881² = 2384408236322, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1091887) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 541 + ... + 1573.

It is an arithmetic number, because the mean of its divisors is an integer number (157168).

2^1091881 is an apocalyptic number.

It is an amenable number.

1091881 is a deficient number, since it is larger than the sum of its proper divisors (165463).

1091881 is a wasteful number, since it uses less digits than its factorization.

1091881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1191.

The product of its (nonzero) digits is 576, while the sum is 28.

The square root of 1091881 is about 1044.9310982070. The cubic root of 1091881 is about 102.9734119326.

The spelling of 1091881 in words is "one million, ninety-one thousand, eight hundred eighty-one".