1591881 has 8 divisors (see below), whose sum is σ = 2191104. Its totient is φ = 1026960.

The previous prime is 1591873. The next prime is 1591883. The reversal of 1591881 is 1881951.

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

It is not a de Polignac number, because 1591881 - 2³ = 1591873 is a prime.

It is a super-2 number, since 2×1591881² = 5068170236322, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1591883) 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, 8466 + ... + 8651.

It is an arithmetic number, because the mean of its divisors is an integer number (273888).

2^1591881 is an apocalyptic number.

It is an amenable number.

1591881 is a deficient number, since it is larger than the sum of its proper divisors (599223).

1591881 is a wasteful number, since it uses less digits than its factorization.

1591881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17151.

The product of its digits is 2880, while the sum is 33.

The square root of 1591881 is about 1261.6976658455. The cubic root of 1591881 is about 116.7625397869.

The spelling of 1591881 in words is "one million, five hundred ninety-one thousand, eight hundred eighty-one".