1881491 has 4 divisors (see below), whose sum is σ = 1946400. Its totient is φ = 1816584.

The previous prime is 1881479. The next prime is 1881493. The reversal of 1881491 is 1941881.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1881491 - 2¹⁰ = 1880467 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1881493) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 32411 + ... + 32468.

It is an arithmetic number, because the mean of its divisors is an integer number (486600).

2^1881491 is an apocalyptic number.

1881491 is a deficient number, since it is larger than the sum of its proper divisors (64909).

1881491 is an equidigital number, since it uses as much as digits as its factorization.

1881491 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 64908.

The product of its digits is 2304, while the sum is 32.

The square root of 1881491 is about 1371.6745240763. The cubic root of 1881491 is about 123.4527347858.

The spelling of 1881491 in words is "one million, eight hundred eighty-one thousand, four hundred ninety-one".