2181948453 has 12 divisors (see below), whose sum is σ = 3337097868. Its totient is φ = 1369065600.

The previous prime is 2181948451. The next prime is 2181948493. The reversal of 2181948453 is 3548491812.

2181948453 is a `hidden beast` number, since 2 + 1 + 8 + 194 + 8 + 453 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 1508390244 + 673558209 = 38838^2 + 25953^2 .

It is not a de Polignac number, because 2181948453 - 2¹ = 2181948451 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 2181948399 and 2181948408.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2181948451) 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, 7130398 + ... + 7130703.

It is an arithmetic number, because the mean of its divisors is an integer number (278091489).

Almost surely, 2^2181948453 is an apocalyptic number.

It is an amenable number.

2181948453 is a deficient number, since it is larger than the sum of its proper divisors (1155149415).

2181948453 is a wasteful number, since it uses less digits than its factorization.

2181948453 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14261124 (or 14261121 counting only the distinct ones).

The product of its digits is 276480, while the sum is 45.

The square root of 2181948453 is about 46711.3310985675. The cubic root of 2181948453 is about 1297.0244475517.

The spelling of 2181948453 in words is "two billion, one hundred eighty-one million, nine hundred forty-eight thousand, four hundred fifty-three".