2161037600 has 36 divisors (see below), whose sum is σ = 5275634994. Its totient is φ = 864414720.

The previous prime is 2161037539. The next prime is 2161037609. The reversal of 2161037600 is 67301612.

It can be written as a sum of positive squares in 3 ways, for example, as 1161719056 + 999318544 = 34084^2 + 31612^2 .

It is a super-2 number, since 2×2161037600² = 9340167017227520000, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 2161037600.

It is not an unprimeable number, because it can be changed into a prime (2161037609) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1349849 + ... + 1351448.

Almost surely, 2^2161037600 is an apocalyptic number.

2161037600 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2161037600 is an abundant number, since it is smaller than the sum of its proper divisors (3114597394).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

2161037600 is a wasteful number, since it uses less digits than its factorization.

2161037600 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2701317 (or 2701304 counting only the distinct ones).

The product of its (nonzero) digits is 1512, while the sum is 26.

The square root of 2161037600 is about 46486.9616129082. The cubic root of 2161037600 is about 1292.8677662028.

The spelling of 2161037600 in words is "two billion, one hundred sixty-one million, thirty-seven thousand, six hundred".