1611491 has 4 divisors (see below), whose sum is σ = 1841712. Its totient is φ = 1381272.

The previous prime is 1611479. The next prime is 1611499. The reversal of 1611491 is 1941161.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1941161 = 307 ⋅6323.

It is a cyclic number.

It is not a de Polignac number, because 1611491 - 2¹⁰ = 1610467 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1611499) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 115100 + ... + 115113.

It is an arithmetic number, because the mean of its divisors is an integer number (460428).

2^1611491 is an apocalyptic number.

1611491 is a deficient number, since it is larger than the sum of its proper divisors (230221).

1611491 is an equidigital number, since it uses as much as digits as its factorization.

1611491 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 230220.

The product of its digits is 216, while the sum is 23.

The square root of 1611491 is about 1269.4451543883. The cubic root of 1611491 is about 117.2400409494.

The spelling of 1611491 in words is "one million, six hundred eleven thousand, four hundred ninety-one".