2145645841 has 2 divisors, whose sum is σ = 2145645842. Its totient is φ = 2145645840.

The previous prime is 2145645797. The next prime is 2145645847. The reversal of 2145645841 is 1485465412.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1840410000 + 305235841 = 42900^2 + 17471^2 .

It is a cyclic number.

It is not a de Polignac number, because 2145645841 - 2¹³ = 2145637649 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 2145645794 and 2145645803.

It is not a weakly prime, because it can be changed into another prime (2145645847) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1072822920 + 1072822921.

It is an arithmetic number, because the mean of its divisors is an integer number (1072822921).

Almost surely, 2^2145645841 is an apocalyptic number.

It is an amenable number.

2145645841 is a deficient number, since it is larger than the sum of its proper divisors (1).

2145645841 is an equidigital number, since it uses as much as digits as its factorization.

2145645841 is an evil number, because the sum of its binary digits is even.

The product of its digits is 153600, while the sum is 40.

The square root of 2145645841 is about 46321.1165776474. The cubic root of 2145645841 is about 1289.7910125561.

The spelling of 2145645841 in words is "two billion, one hundred forty-five million, six hundred forty-five thousand, eight hundred forty-one".