2181750001 has 2 divisors, whose sum is σ = 2181750002. Its totient is φ = 2181750000.

The previous prime is 2181749959. The next prime is 2181750007. The reversal of 2181750001 is 1000571812.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2122997776 + 58752225 = 46076^2 + 7665^2 .

It is a cyclic number.

It is not a de Polignac number, because 2181750001 - 2¹⁹ = 2181225713 is a prime.

It is not a weakly prime, because it can be changed into another prime (2181750007) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1090875000 + 1090875001.

It is an arithmetic number, because the mean of its divisors is an integer number (1090875001).

Almost surely, 2^2181750001 is an apocalyptic number.

It is an amenable number.

2181750001 is a deficient number, since it is larger than the sum of its proper divisors (1).

2181750001 is an equidigital number, since it uses as much as digits as its factorization.

2181750001 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 560, while the sum is 25.

The square root of 2181750001 is about 46709.2068119338. The cubic root of 2181750001 is about 1296.9851241510.

The spelling of 2181750001 in words is "two billion, one hundred eighty-one million, seven hundred fifty thousand, one".