1216589252 has 24 divisors (see below), whose sum is σ = 2147342400. Its totient is φ = 603083936.

The previous prime is 1216589249. The next prime is 1216589273. The reversal of 1216589252 is 2529856121.

It is an alternating number because its digits alternate between odd and even.

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, 254678 + ... + 259410.

It is an arithmetic number, because the mean of its divisors is an integer number (89472600).

Almost surely, 2^1216589252 is an apocalyptic number.

It is an amenable number.

1216589252 is a deficient number, since it is larger than the sum of its proper divisors (930753148).

1216589252 is a wasteful number, since it uses less digits than its factorization.

1216589252 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5275 (or 5273 counting only the distinct ones).

The product of its digits is 86400, while the sum is 41.

The square root of 1216589252 is about 34879.6395050178. The cubic root of 1216589252 is about 1067.5330396530.

The spelling of 1216589252 in words is "one billion, two hundred sixteen million, five hundred eighty-nine thousand, two hundred fifty-two".