2145204989 has 2 divisors, whose sum is σ = 2145204990. Its totient is φ = 2145204988.

The previous prime is 2145204979. The next prime is 2145205019. The reversal of 2145204989 is 9894025412.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1485485764 + 659719225 = 38542^2 + 25685^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2145204989 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2145204949) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1072602494 + 1072602495.

It is an arithmetic number, because the mean of its divisors is an integer number (1072602495).

Almost surely, 2^2145204989 is an apocalyptic number.

It is an amenable number.

2145204989 is a deficient number, since it is larger than the sum of its proper divisors (1).

2145204989 is an equidigital number, since it uses as much as digits as its factorization.

2145204989 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 207360, while the sum is 44.

The square root of 2145204989 is about 46316.3576827885. The cubic root of 2145204989 is about 1289.7026714945.

The spelling of 2145204989 in words is "two billion, one hundred forty-five million, two hundred four thousand, nine hundred eighty-nine".