1225917129 has 8 divisors (see below), whose sum is σ = 1636233120. Its totient is φ = 816439616.

The previous prime is 1225917079. The next prime is 1225917131. The reversal of 1225917129 is 9217195221.

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 1225917129 - 2⁹ = 1225916617 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1225917529) 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, 206199 + ... + 212060.

It is an arithmetic number, because the mean of its divisors is an integer number (204529140).

Almost surely, 2^1225917129 is an apocalyptic number.

It is an amenable number.

1225917129 is a deficient number, since it is larger than the sum of its proper divisors (410315991).

1225917129 is an equidigital number, since it uses as much as digits as its factorization.

1225917129 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 419239.

The product of its digits is 22680, while the sum is 39.

The square root of 1225917129 is about 35013.0993915135. The cubic root of 1225917129 is about 1070.2544388654.

The spelling of 1225917129 in words is "one billion, two hundred twenty-five million, nine hundred seventeen thousand, one hundred twenty-nine".