1881081 has 12 divisors (see below), whose sum is σ = 2775552. Its totient is φ = 1227096.

The previous prime is 1881079. The next prime is 1881083. The reversal of 1881081 is 1801881.

It is an interprime number because it is at equal distance from previous prime (1881079) and next prime (1881083).

It is not a de Polignac number, because 1881081 - 2¹ = 1881079 is a prime.

It is a super-2 number, since 2×1881081² = 7076931457122, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1881083) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1801 + ... + 2646.

It is an arithmetic number, because the mean of its divisors is an integer number (231296).

2^1881081 is an apocalyptic number.

It is an amenable number.

1881081 is a deficient number, since it is larger than the sum of its proper divisors (894471).

1881081 is a wasteful number, since it uses less digits than its factorization.

1881081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4500 (or 4497 counting only the distinct ones).

The product of its (nonzero) digits is 512, while the sum is 27.

The square root of 1881081 is about 1371.5250635697. The cubic root of 1881081 is about 123.4437668452.

The spelling of 1881081 in words is "one million, eight hundred eighty-one thousand, eighty-one".