1225264279 has 4 divisors (see below), whose sum is σ = 1229129784. Its totient is φ = 1221398776.

The previous prime is 1225264247. The next prime is 1225264301. The reversal of 1225264279 is 9724625221.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 9724625221 = 41 ⋅237185981.

It is a cyclic number.

It is not a de Polignac number, because 1225264279 - 2⁵ = 1225264247 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 (1225214279) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1932277 + ... + 1932910.

It is an arithmetic number, because the mean of its divisors is an integer number (307282446).

Almost surely, 2^1225264279 is an apocalyptic number.

1225264279 is a deficient number, since it is larger than the sum of its proper divisors (3865505).

1225264279 is an equidigital number, since it uses as much as digits as its factorization.

1225264279 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3865504.

The product of its digits is 120960, while the sum is 40.

The square root of 1225264279 is about 35003.7752106826. The cubic root of 1225264279 is about 1070.0644206708.

The spelling of 1225264279 in words is "one billion, two hundred twenty-five million, two hundred sixty-four thousand, two hundred seventy-nine".