4991601 has 4 divisors (see below), whose sum is σ = 6655472. Its totient is φ = 3327732.

The previous prime is 4991587. The next prime is 4991617. The reversal of 4991601 is 1061994.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 4991601 - 2⁷ = 4991473 is a prime.

It is a D-number.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (4991671) 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, 831931 + ... + 831936.

It is an arithmetic number, because the mean of its divisors is an integer number (1663868).

Almost surely, 2^4991601 is an apocalyptic number.

It is an amenable number.

4991601 is a deficient number, since it is larger than the sum of its proper divisors (1663871).

4991601 is a wasteful number, since it uses less digits than its factorization.

4991601 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1663870.

The product of its (nonzero) digits is 1944, while the sum is 30.

The square root of 4991601 is about 2234.1891146454. The cubic root of 4991601 is about 170.9017937523.

The spelling of 4991601 in words is "four million, nine hundred ninety-one thousand, six hundred one".