611491 has 4 divisors (see below), whose sum is σ = 613872. Its totient is φ = 609112.

The previous prime is 611483. The next prime is 611497. The reversal of 611491 is 194116.

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 611491 - 2³ = 611483 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (611497) 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, 751 + ... + 1336.

It is an arithmetic number, because the mean of its divisors is an integer number (153468).

2⁶¹¹⁴⁹¹ is an apocalyptic number.

611491 is a deficient number, since it is larger than the sum of its proper divisors (2381).

611491 is a wasteful number, since it uses less digits than its factorization.

611491 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2380.

The product of its digits is 216, while the sum is 22.

The square root of 611491 is about 781.9788999711. The cubic root of 611491 is about 84.8783033556.

It can be divided in two parts, 61 and 1491, that multiplied together give a triangular number (90951 = T₄₂₆).

The spelling of 611491 in words is "six hundred eleven thousand, four hundred ninety-one".