1225797879 has 4 divisors (see below), whose sum is σ = 1634397176. Its totient is φ = 817198584.

The previous prime is 1225797799. The next prime is 1225797941. The reversal of 1225797879 is 9787975221.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 9787975221 = 3 ⋅3262658407.

It is not a de Polignac number, because 1225797879 - 2⁷ = 1225797751 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1225797479) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 204299644 + ... + 204299649.

It is an arithmetic number, because the mean of its divisors is an integer number (408599294).

Almost surely, 2^1225797879 is an apocalyptic number.

1225797879 is a deficient number, since it is larger than the sum of its proper divisors (408599297).

1225797879 is an equidigital number, since it uses as much as digits as its factorization.

1225797879 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 408599296.

The product of its digits is 4445280, while the sum is 57.

The square root of 1225797879 is about 35011.3964160243. The cubic root of 1225797879 is about 1070.2197350567.

The spelling of 1225797879 in words is "one billion, two hundred twenty-five million, seven hundred ninety-seven thousand, eight hundred seventy-nine".