1245155217 has 8 divisors (see below), whose sum is σ = 1669804224. Its totient is φ = 825304848.

The previous prime is 1245155213. The next prime is 1245155227. The reversal of 1245155217 is 7125515421.

1245155217 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1245155217 - 2² = 1245155213 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1245155213) 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, 1199053 + ... + 1200090.

It is an arithmetic number, because the mean of its divisors is an integer number (208725528).

Almost surely, 2^1245155217 is an apocalyptic number.

It is an amenable number.

1245155217 is a deficient number, since it is larger than the sum of its proper divisors (424649007).

1245155217 is a wasteful number, since it uses less digits than its factorization.

1245155217 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2399319.

The product of its digits is 14000, while the sum is 33.

The square root of 1245155217 is about 35286.7569634842. The cubic root of 1245155217 is about 1075.8238406605.

The spelling of 1245155217 in words is "one billion, two hundred forty-five million, one hundred fifty-five thousand, two hundred seventeen".