2145321929 has 2 divisors, whose sum is σ = 2145321930. Its totient is φ = 2145321928.

The previous prime is 2145321887. The next prime is 2145321931. The reversal of 2145321929 is 9291235412.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1652259904 + 493062025 = 40648^2 + 22205^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2145321929 is a prime.

Together with 2145321931, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 2145321892 and 2145321901.

It is not a weakly prime, because it can be changed into another prime (2145321989) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1072660964 + 1072660965.

It is an arithmetic number, because the mean of its divisors is an integer number (1072660965).

Almost surely, 2^2145321929 is an apocalyptic number.

It is an amenable number.

2145321929 is a deficient number, since it is larger than the sum of its proper divisors (1).

2145321929 is an equidigital number, since it uses as much as digits as its factorization.

2145321929 is an evil number, because the sum of its binary digits is even.

The product of its digits is 38880, while the sum is 38.

The square root of 2145321929 is about 46317.6200705520. The cubic root of 2145321929 is about 1289.7261059434.

The spelling of 2145321929 in words is "two billion, one hundred forty-five million, three hundred twenty-one thousand, nine hundred twenty-nine".