1217148988 has 12 divisors (see below), whose sum is σ = 2323648152. Its totient is φ = 553249520.

The previous prime is 1217148979. The next prime is 1217148991. The reversal of 1217148988 is 8898417121.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13831195 + ... + 13831282.

It is an arithmetic number, because the mean of its divisors is an integer number (193637346).

Almost surely, 2^1217148988 is an apocalyptic number.

It is an amenable number.

1217148988 is a deficient number, since it is larger than the sum of its proper divisors (1106499164).

1217148988 is a wasteful number, since it uses less digits than its factorization.

1217148988 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27662492 (or 27662490 counting only the distinct ones).

The product of its digits is 258048, while the sum is 49.

The square root of 1217148988 is about 34887.6624037782. The cubic root of 1217148988 is about 1067.6967336459.

The spelling of 1217148988 in words is "one billion, two hundred seventeen million, one hundred forty-eight thousand, nine hundred eighty-eight".