2091401 has 4 divisors (see below), whose sum is σ = 2252292. Its totient is φ = 1930512.

The previous prime is 2091389. The next prime is 2091409. The reversal of 2091401 is 1041902.

It is a happy number.

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

It can be written as a sum of positive squares in 2 ways, for example, as 883600 + 1207801 = 940^2 + 1099^2 .

It is a cyclic number.

It is not a de Polignac number, because 2091401 - 2⁶ = 2091337 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 2091401.

It is not an unprimeable number, because it can be changed into a prime (2091409) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 80426 + ... + 80451.

It is an arithmetic number, because the mean of its divisors is an integer number (563073).

2^2091401 is an apocalyptic number.

It is an amenable number.

2091401 is a deficient number, since it is larger than the sum of its proper divisors (160891).

2091401 is a wasteful number, since it uses less digits than its factorization.

2091401 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 160890.

The product of its (nonzero) digits is 72, while the sum is 17.

The square root of 2091401 is about 1446.1676942872. The cubic root of 2091401 is about 127.8828884889.

The spelling of 2091401 in words is "two million, ninety-one thousand, four hundred one".