1225780117 has 4 divisors (see below), whose sum is σ = 1290294880. Its totient is φ = 1161265356.

The previous prime is 1225780111. The next prime is 1225780151. The reversal of 1225780117 is 7110875221.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1225780117 - 2³ = 1225780109 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 (1225780111) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 32257353 + ... + 32257390.

It is an arithmetic number, because the mean of its divisors is an integer number (322573720).

Almost surely, 2^1225780117 is an apocalyptic number.

It is an amenable number.

1225780117 is a deficient number, since it is larger than the sum of its proper divisors (64514763).

1225780117 is an equidigital number, since it uses as much as digits as its factorization.

1225780117 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 64514762.

The product of its (nonzero) digits is 7840, while the sum is 34.

The square root of 1225780117 is about 35011.1427548431. The cubic root of 1225780117 is about 1070.2145658155.

The spelling of 1225780117 in words is "one billion, two hundred twenty-five million, seven hundred eighty thousand, one hundred seventeen".