2611491 has 4 divisors (see below), whose sum is σ = 3481992. Its totient is φ = 1740992.

The previous prime is 2611487. The next prime is 2611507. The reversal of 2611491 is 1941162.

Added to its reverse (1941162) it gives a triangular number (4552653 = T₃₀₁₇).

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 2611491 - 2² = 2611487 is a prime.

It is a D-number.

2611491 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (2611481) 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, 435246 + ... + 435251.

It is an arithmetic number, because the mean of its divisors is an integer number (870498).

2^2611491 is an apocalyptic number.

2611491 is a deficient number, since it is larger than the sum of its proper divisors (870501).

2611491 is an equidigital number, since it uses as much as digits as its factorization.

2611491 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 870500.

The product of its digits is 432, while the sum is 24.

The square root of 2611491 is about 1616.0108291716. The cubic root of 2611491 is about 137.7091648529.

Adding to 2611491 its reverse (1941162), we get a triangular number (4552653 = T₃₀₁₇).

The spelling of 2611491 in words is "two million, six hundred eleven thousand, four hundred ninety-one".