1225409779 has 8 divisors (see below), whose sum is σ = 1339020288. Its totient is φ = 1112167560.

The previous prime is 1225409777. The next prime is 1225409791. The reversal of 1225409779 is 9779045221.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1225409779 - 2¹ = 1225409777 is a prime.

It is a super-3 number, since 3×1225409779³ (a number of 28 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1225409777) 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 7 ways as a sum of consecutive naturals, for example, 85087 + ... + 98440.

It is an arithmetic number, because the mean of its divisors is an integer number (167377536).

Almost surely, 2^1225409779 is an apocalyptic number.

1225409779 is a deficient number, since it is larger than the sum of its proper divisors (113610509).

1225409779 is a wasteful number, since it uses less digits than its factorization.

1225409779 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 184145.

The product of its (nonzero) digits is 317520, while the sum is 46.

The square root of 1225409779 is about 35005.8534962369. The cubic root of 1225409779 is about 1070.1067756722.

The spelling of 1225409779 in words is "one billion, two hundred twenty-five million, four hundred nine thousand, seven hundred seventy-nine".