2145554249 has 2 divisors, whose sum is σ = 2145554250. Its totient is φ = 2145554248.

The previous prime is 2145554221. The next prime is 2145554251. The reversal of 2145554249 is 9424555412.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1950812224 + 194742025 = 44168^2 + 13955^2 .

It is a cyclic number.

It is not a de Polignac number, because 2145554249 - 2²⁰ = 2144505673 is a prime.

Together with 2145554251, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (2145554849) 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, 1072777124 + 1072777125.

It is an arithmetic number, because the mean of its divisors is an integer number (1072777125).

Almost surely, 2^2145554249 is an apocalyptic number.

It is an amenable number.

2145554249 is a deficient number, since it is larger than the sum of its proper divisors (1).

2145554249 is an equidigital number, since it uses as much as digits as its factorization.

2145554249 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 288000, while the sum is 41.

The square root of 2145554249 is about 46320.1279035367. The cubic root of 2145554249 is about 1289.7726596952.

The spelling of 2145554249 in words is "two billion, one hundred forty-five million, five hundred fifty-four thousand, two hundred forty-nine".