2578212145 has 4 divisors (see below), whose sum is σ = 3093854580. Its totient is φ = 2062569712.

The previous prime is 2578212107. The next prime is 2578212157. The reversal of 2578212145 is 5412128752.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1135959616 + 1442252529 = 33704^2 + 37977^2 .

It is a cyclic number.

It is not a de Polignac number, because 2578212145 - 2¹⁵ = 2578179377 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 257821210 + ... + 257821219.

It is an arithmetic number, because the mean of its divisors is an integer number (773463645).

Almost surely, 2^2578212145 is an apocalyptic number.

It is an amenable number.

2578212145 is a deficient number, since it is larger than the sum of its proper divisors (515642435).

2578212145 is an equidigital number, since it uses as much as digits as its factorization.

2578212145 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 515642434.

The product of its digits is 44800, while the sum is 37.

The square root of 2578212145 is about 50776.0981663617. The cubic root of 2578212145 is about 1371.2170875815.

The spelling of 2578212145 in words is "two billion, five hundred seventy-eight million, two hundred twelve thousand, one hundred forty-five".