2145561629 has 2 divisors, whose sum is σ = 2145561630. Its totient is φ = 2145561628.

The previous prime is 2145561599. The next prime is 2145561631. The reversal of 2145561629 is 9261655412.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1095477604 + 1050084025 = 33098^2 + 32405^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2145561629 is a prime.

It is a Sophie Germain prime.

Together with 2145561631, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2145561659) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1072780814 + 1072780815.

It is an arithmetic number, because the mean of its divisors is an integer number (1072780815).

Almost surely, 2^2145561629 is an apocalyptic number.

It is an amenable number.

2145561629 is a deficient number, since it is larger than the sum of its proper divisors (1).

2145561629 is an equidigital number, since it uses as much as digits as its factorization.

2145561629 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 129600, while the sum is 41.

The square root of 2145561629 is about 46320.2075664607. The cubic root of 2145561629 is about 1289.7741384912.

The spelling of 2145561629 in words is "two billion, one hundred forty-five million, five hundred sixty-one thousand, six hundred twenty-nine".