3641991 has 8 divisors (see below), whose sum is σ = 4875120. Its totient is φ = 2418432.

The previous prime is 3641987. The next prime is 3641999. The reversal of 3641991 is 1991463.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 3641991 - 2² = 3641987 is a prime.

It is a Smith number, since the sum of its digits (33) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3641999) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1450 + ... + 3063.

It is an arithmetic number, because the mean of its divisors is an integer number (609390).

Almost surely, 2^3641991 is an apocalyptic number.

3641991 is a deficient number, since it is larger than the sum of its proper divisors (1233129).

3641991 is a wasteful number, since it uses less digits than its factorization.

3641991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4785.

The product of its digits is 5832, while the sum is 33.

The square root of 3641991 is about 1908.4001152798. The cubic root of 3641991 is about 153.8554752493.

The spelling of 3641991 in words is "three million, six hundred forty-one thousand, nine hundred ninety-one".