2161397 has 16 divisors (see below), whose sum is σ = 2685312. Its totient is φ = 1697280.

The previous prime is 2161373. The next prime is 2161409. The reversal of 2161397 is 7931612.

It is not a de Polignac number, because 2161397 - 2⁸ = 2161141 is a prime.

It is a d-powerful number, because it can be written as 2¹⁹ + 1 + 6⁷ + 1 + 3⁷ + 9⁶ + 7⁷ .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2161337) 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 15 ways as a sum of consecutive naturals, for example, 4658 + ... + 5100.

It is an arithmetic number, because the mean of its divisors is an integer number (167832).

2^2161397 is an apocalyptic number.

It is an amenable number.

2161397 is a deficient number, since it is larger than the sum of its proper divisors (523915).

2161397 is a wasteful number, since it uses less digits than its factorization.

2161397 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 508.

The product of its digits is 2268, while the sum is 29.

The square root of 2161397 is about 1470.1690379001. The cubic root of 2161397 is about 129.2939434078.

The spelling of 2161397 in words is "two million, one hundred sixty-one thousand, three hundred ninety-seven".