4211991 has 18 divisors (see below), whose sum is σ = 7078032. Its totient is φ = 2406600.

The previous prime is 4211983. The next prime is 4211993. The reversal of 4211991 is 1991124.

It is not a de Polignac number, because 4211991 - 2³ = 4211983 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4211993) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 4335 + ... + 5216.

It is an arithmetic number, because the mean of its divisors is an integer number (393224).

Almost surely, 2^4211991 is an apocalyptic number.

4211991 is a deficient number, since it is larger than the sum of its proper divisors (2866041).

4211991 is a wasteful number, since it uses less digits than its factorization.

4211991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9571 (or 9561 counting only the distinct ones).

The product of its digits is 648, while the sum is 27.

The square root of 4211991 is about 2052.3135725322. The cubic root of 4211991 is about 161.4962633366.

The spelling of 4211991 in words is "four million, two hundred eleven thousand, nine hundred ninety-one".