2191401 has 8 divisors (see below), whose sum is σ = 3246560. Its totient is φ = 1460916.

The previous prime is 2191393. The next prime is 2191429. The reversal of 2191401 is 1041912.

It is not a de Polignac number, because 2191401 - 2³ = 2191393 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2191451) 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, 40555 + ... + 40608.

It is an arithmetic number, because the mean of its divisors is an integer number (405820).

2^2191401 is an apocalyptic number.

It is an amenable number.

2191401 is a deficient number, since it is larger than the sum of its proper divisors (1055159).

2191401 is an equidigital number, since it uses as much as digits as its factorization.

2191401 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 81172 (or 81166 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 18.

The square root of 2191401 is about 1480.3381370484. The cubic root of 2191401 is about 129.8894721292.

The spelling of 2191401 in words is "two million, one hundred ninety-one thousand, four hundred one".