1225913817 has 16 divisors (see below), whose sum is σ = 1728437760. Its totient is φ = 771619200.

The previous prime is 1225913813. The next prime is 1225913837. The reversal of 1225913817 is 7183195221.

It is a happy number.

It is not a de Polignac number, because 1225913817 - 2² = 1225913813 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1225913813) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 156942 + ... + 164567.

It is an arithmetic number, because the mean of its divisors is an integer number (108027360).

Almost surely, 2^1225913817 is an apocalyptic number.

It is an amenable number.

1225913817 is a deficient number, since it is larger than the sum of its proper divisors (502523943).

1225913817 is a wasteful number, since it uses less digits than its factorization.

1225913817 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 321584.

The product of its digits is 30240, while the sum is 39.

The square root of 1225913817 is about 35013.0520948974. The cubic root of 1225913817 is about 1070.2534750466.

The spelling of 1225913817 in words is "one billion, two hundred twenty-five million, nine hundred thirteen thousand, eight hundred seventeen".