4461991 has 4 divisors (see below), whose sum is σ = 4496184. Its totient is φ = 4427800.

The previous prime is 4461971. The next prime is 4462009. The reversal of 4461991 is 1991644.

It is a semiprime because it is the product of two primes.

It is a de Polignac number, because none of the positive numbers 2^k-4461991 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4461901) 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, 16900 + ... + 17161.

It is an arithmetic number, because the mean of its divisors is an integer number (1124046).

Almost surely, 2^4461991 is an apocalyptic number.

4461991 is a deficient number, since it is larger than the sum of its proper divisors (34193).

4461991 is a wasteful number, since it uses less digits than its factorization.

4461991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34192.

The product of its digits is 7776, while the sum is 34.

The square root of 4461991 is about 2112.3425385103. The cubic root of 4461991 is about 164.6302218094.

It can be divided in two parts, 4461 and 991, that multiplied together give a triangular number (4420851 = T₂₉₇₃).

The spelling of 4461991 in words is "four million, four hundred sixty-one thousand, nine hundred ninety-one".