2161537 has 12 divisors (see below), whose sum is σ = 2597376. Its totient is φ = 1791720.

The previous prime is 2161513. The next prime is 2161553. The reversal of 2161537 is 7351612.

It is not a de Polignac number, because 2161537 - 2⁷ = 2161409 is a prime.

It is a Duffinian number.

2161537 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (2161337) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 808 + ... + 2230.

It is an arithmetic number, because the mean of its divisors is an integer number (216448).

2^2161537 is an apocalyptic number.

It is an amenable number.

2161537 is a deficient number, since it is larger than the sum of its proper divisors (435839).

2161537 is a wasteful number, since it uses less digits than its factorization.

2161537 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1468 (or 1461 counting only the distinct ones).

The product of its digits is 1260, while the sum is 25.

The square root of 2161537 is about 1470.2166507015. The cubic root of 2161537 is about 129.2967349297.

The spelling of 2161537 in words is "two million, one hundred sixty-one thousand, five hundred thirty-seven".