1225720117 has 8 divisors (see below), whose sum is σ = 1308757824. Its totient is φ = 1145161248.

The previous prime is 1225720109. The next prime is 1225720159. The reversal of 1225720117 is 7110275221.

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 1225720117 - 2³ = 1225720109 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 (1225720217) 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, 618688 + ... + 620665.

It is an arithmetic number, because the mean of its divisors is an integer number (163594728).

Almost surely, 2^1225720117 is an apocalyptic number.

It is an amenable number.

1225720117 is a deficient number, since it is larger than the sum of its proper divisors (83037707).

1225720117 is a wasteful number, since it uses less digits than its factorization.

1225720117 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1239419.

The product of its (nonzero) digits is 1960, while the sum is 28.

The square root of 1225720117 is about 35010.2858742970. The cubic root of 1225720117 is about 1070.1971037599.

Adding to 1225720117 its reverse (7110275221), we get a palindrome (8335995338).

The spelling of 1225720117 in words is "one billion, two hundred twenty-five million, seven hundred twenty thousand, one hundred seventeen".