1031881 has 4 divisors (see below), whose sum is σ = 1037764. Its totient is φ = 1026000.

The previous prime is 1031869. The next prime is 1031911. The reversal of 1031881 is 1881301.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1881301 = 61 ⋅30841.

It can be written as a sum of positive squares in 2 ways, for example, as 366025 + 665856 = 605^2 + 816^2 .

It is a cyclic number.

It is not a de Polignac number, because 1031881 - 2⁷ = 1031753 is a prime.

It is a super-2 number, since 2×1031881² = 2129556796322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1031831) 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, 2670 + ... + 3031.

It is an arithmetic number, because the mean of its divisors is an integer number (259441).

2^1031881 is an apocalyptic number.

It is an amenable number.

1031881 is a deficient number, since it is larger than the sum of its proper divisors (5883).

1031881 is an equidigital number, since it uses as much as digits as its factorization.

1031881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5882.

The product of its (nonzero) digits is 192, while the sum is 22.

The square root of 1031881 is about 1015.8154359922. The cubic root of 1031881 is about 101.0516025562.

The spelling of 1031881 in words is "one million, thirty-one thousand, eight hundred eighty-one".