4991611 has 4 divisors (see below), whose sum is σ = 4998672. Its totient is φ = 4984552.

The previous prime is 4991587. The next prime is 4991617. The reversal of 4991611 is 1161994.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1161994 = 2 ⋅580997.

It is a cyclic number.

It is not a de Polignac number, because 4991611 - 2¹⁵ = 4958843 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (4991617) 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, 2335 + ... + 3928.

It is an arithmetic number, because the mean of its divisors is an integer number (1249668).

Almost surely, 2^4991611 is an apocalyptic number.

4991611 is a deficient number, since it is larger than the sum of its proper divisors (7061).

4991611 is an equidigital number, since it uses as much as digits as its factorization.

4991611 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7060.

The product of its digits is 1944, while the sum is 31.

The square root of 4991611 is about 2234.1913525927. The cubic root of 4991611 is about 170.9019078785.

The spelling of 4991611 in words is "four million, nine hundred ninety-one thousand, six hundred eleven".