2201391 has 8 divisors (see below), whose sum is σ = 3261360. Its totient is φ = 1467576.

The previous prime is 2201387. The next prime is 2201393. The reversal of 2201391 is 1931022.

It is a happy number.

It is not a de Polignac number, because 2201391 - 2² = 2201387 is a prime.

It is a super-2 number, since 2×2201391² = 9692244669762, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2201393) 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, 40740 + ... + 40793.

It is an arithmetic number, because the mean of its divisors is an integer number (407670).

2^2201391 is an apocalyptic number.

2201391 is a deficient number, since it is larger than the sum of its proper divisors (1059969).

2201391 is an equidigital number, since it uses as much as digits as its factorization.

2201391 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 81542 (or 81536 counting only the distinct ones).

The product of its (nonzero) digits is 108, while the sum is 18.

The square root of 2201391 is about 1483.7085293278. The cubic root of 2201391 is about 130.0865498601.

The spelling of 2201391 in words is "two million, two hundred one thousand, three hundred ninety-one".