2145561599 has 2 divisors, whose sum is σ = 2145561600. Its totient is φ = 2145561598.

The previous prime is 2145561581. The next prime is 2145561629. The reversal of 2145561599 is 9951655412.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 2145561599 - 2¹² = 2145557503 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2145561199) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1072780799 + 1072780800.

It is an arithmetic number, because the mean of its divisors is an integer number (1072780800).

Almost surely, 2^2145561599 is an apocalyptic number.

2145561599 is a deficient number, since it is larger than the sum of its proper divisors (1).

2145561599 is an equidigital number, since it uses as much as digits as its factorization.

2145561599 is an evil number, because the sum of its binary digits is even.

The product of its digits is 486000, while the sum is 47.

The square root of 2145561599 is about 46320.2072426279. The cubic root of 2145561599 is about 1289.7741324798.

The spelling of 2145561599 in words is "two billion, one hundred forty-five million, five hundred sixty-one thousand, five hundred ninety-nine".