1081491 has 4 divisors (see below), whose sum is σ = 1441992. Its totient is φ = 720992.

The previous prime is 1081477. The next prime is 1081501. The reversal of 1081491 is 1941801.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1081491 is a prime.

It is a D-number.

It is not an unprimeable number, because it can be changed into a prime (1081441) 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, 180246 + ... + 180251.

It is an arithmetic number, because the mean of its divisors is an integer number (360498).

2^1081491 is an apocalyptic number.

1081491 is a deficient number, since it is larger than the sum of its proper divisors (360501).

1081491 is an equidigital number, since it uses as much as digits as its factorization.

1081491 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 360500.

The product of its (nonzero) digits is 288, while the sum is 24.

The square root of 1081491 is about 1039.9475948335. The cubic root of 1081491 is about 102.6457494258.

It can be divided in two parts, 108 and 1491, that multiplied together give a triangular number (161028 = T₅₆₇).

The spelling of 1081491 in words is "one million, eighty-one thousand, four hundred ninety-one".