2161047 has 24 divisors (see below), whose sum is σ = 3420912. Its totient is φ = 1209600.

The previous prime is 2161031. The next prime is 2161087. The reversal of 2161047 is 7401612.

It is not a de Polignac number, because 2161047 - 2⁴ = 2161031 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

2161047 is a lucky number.

It is a plaindrome in base 11.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2161007) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 8847 + ... + 9087.

It is an arithmetic number, because the mean of its divisors is an integer number (142538).

2^2161047 is an apocalyptic number.

2161047 is a deficient number, since it is larger than the sum of its proper divisors (1259865).

2161047 is a wasteful number, since it uses less digits than its factorization.

2161047 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 319 (or 312 counting only the distinct ones).

The product of its (nonzero) digits is 336, while the sum is 21.

The square root of 2161047 is about 1470.0499991497. The cubic root of 2161047 is about 129.2869640756.

Adding to 2161047 its reverse (7401612), we get a palindrome (9562659).

The spelling of 2161047 in words is "two million, one hundred sixty-one thousand, forty-seven".