2145254249 has 2 divisors, whose sum is σ = 2145254250. Its totient is φ = 2145254248.

The previous prime is 2145254213. The next prime is 2145254269. The reversal of 2145254249 is 9424525412.

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., 1993176025 + 152078224 = 44645^2 + 12332^2 .

It is a cyclic number.

It is not a de Polignac number, because 2145254249 - 2¹⁶ = 2145188713 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (2145254269) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1072627124 + 1072627125.

It is an arithmetic number, because the mean of its divisors is an integer number (1072627125).

Almost surely, 2^2145254249 is an apocalyptic number.

It is an amenable number.

2145254249 is a deficient number, since it is larger than the sum of its proper divisors (1).

2145254249 is an equidigital number, since it uses as much as digits as its factorization.

2145254249 is an evil number, because the sum of its binary digits is even.

The product of its digits is 115200, while the sum is 38.

The square root of 2145254249 is about 46316.8894573027. The cubic root of 2145254249 is about 1289.7125431645.

The spelling of 2145254249 in words is "two billion, one hundred forty-five million, two hundred fifty-four thousand, two hundred forty-nine".