279225145 has 4 divisors (see below), whose sum is σ = 335070180. Its totient is φ = 223380112.

The previous prime is 279225077. The next prime is 279225157. The reversal of 279225145 is 541522972.

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 69438889 + 209786256 = 8333^2 + 14484^2 .

It is a cyclic number.

It is not a de Polignac number, because 279225145 - 2¹³ = 279216953 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, 27922510 + ... + 27922519.

It is an arithmetic number, because the mean of its divisors is an integer number (83767545).

Almost surely, 2^279225145 is an apocalyptic number.

It is an amenable number.

279225145 is a deficient number, since it is larger than the sum of its proper divisors (55845035).

279225145 is an equidigital number, since it uses as much as digits as its factorization.

279225145 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55845034.

The product of its digits is 50400, while the sum is 37.

The square root of 279225145 is about 16710.0312686721. The cubic root of 279225145 is about 653.6092278183.

The spelling of 279225145 in words is "two hundred seventy-nine million, two hundred twenty-five thousand, one hundred forty-five".