1225644347 has 8 divisors (see below), whose sum is σ = 1247082480. Its totient is φ = 1204228480.

The previous prime is 1225644337. The next prime is 1225644353. The reversal of 1225644347 is 7434465221.

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 a de Polignac number, because none of the positive numbers 2^k-1225644347 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1225644347.

It is not an unprimeable number, because it can be changed into a prime (1225644307) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 136847 + ... + 145527.

It is an arithmetic number, because the mean of its divisors is an integer number (155885310).

Almost surely, 2^1225644347 is an apocalyptic number.

1225644347 is a deficient number, since it is larger than the sum of its proper divisors (21438133).

1225644347 is an equidigital number, since it uses as much as digits as its factorization.

1225644347 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11133.

The product of its digits is 161280, while the sum is 38.

The square root of 1225644347 is about 35009.2037470149. The cubic root of 1225644347 is about 1070.1750512798.

The spelling of 1225644347 in words is "one billion, two hundred twenty-five million, six hundred forty-four thousand, three hundred forty-seven".