2181741907 has 2 divisors, whose sum is σ = 2181741908. Its totient is φ = 2181741906.

The previous prime is 2181741827. The next prime is 2181741917. The reversal of 2181741907 is 7091471812.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2181741907 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 2181741907.

It is not a weakly prime, because it can be changed into another prime (2181741917) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1090870953 + 1090870954.

It is an arithmetic number, because the mean of its divisors is an integer number (1090870954).

Almost surely, 2^2181741907 is an apocalyptic number.

2181741907 is a deficient number, since it is larger than the sum of its proper divisors (1).

2181741907 is an equidigital number, since it uses as much as digits as its factorization.

2181741907 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 28224, while the sum is 40.

The square root of 2181741907 is about 46709.1201694059. The cubic root of 2181741907 is about 1296.9835202687.

The spelling of 2181741907 in words is "two billion, one hundred eighty-one million, seven hundred forty-one thousand, nine hundred seven".