1217198528 has 56 divisors (see below), whose sum is σ = 2972787552. Its totient is φ = 481526784.

The previous prime is 1217198519. The next prime is 1217198537. The reversal of 1217198528 is 8258917121.

It is an interprime number because it is at equal distance from previous prime (1217198519) and next prime (1217198537).

It is a tau number, because it is divible by the number of its divisors (56).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 98675 + ... + 110322.

It is an arithmetic number, because the mean of its divisors is an integer number (53085492).

Almost surely, 2^1217198528 is an apocalyptic number.

It is an amenable number.

1217198528 is an abundant number, since it is smaller than the sum of its proper divisors (1755589024).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1217198528 is a wasteful number, since it uses less digits than its factorization.

1217198528 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 209029 (or 209019 counting only the distinct ones).

The product of its digits is 80640, while the sum is 44.

The square root of 1217198528 is about 34888.3723896659. The cubic root of 1217198528 is about 1067.7112191305.

The spelling of 1217198528 in words is "one billion, two hundred seventeen million, one hundred ninety-eight thousand, five hundred twenty-eight".