1216989170 has 16 divisors (see below), whose sum is σ = 2201703768. Its totient is φ = 484323840.

The previous prime is 1216989167. The next prime is 1216989199. The reversal of 1216989170 is 719896121.

It can be written as a sum of positive squares in 4 ways, for example, as 1216126129 + 863041 = 34873^2 + 929^2 .

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 306911 + ... + 310850.

Almost surely, 2^1216989170 is an apocalyptic number.

1216989170 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1216989170 is a deficient number, since it is larger than the sum of its proper divisors (984714598).

1216989170 is a wasteful number, since it uses less digits than its factorization.

1216989170 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 617965.

The product of its (nonzero) digits is 54432, while the sum is 44.

The square root of 1216989170 is about 34885.3718627163. The cubic root of 1216989170 is about 1067.6500002202.

The spelling of 1216989170 in words is "one billion, two hundred sixteen million, nine hundred eighty-nine thousand, one hundred seventy".