1216261230 has 16 divisors (see below), whose sum is σ = 2919027024. Its totient is φ = 324336320.

The previous prime is 1216261219. The next prime is 1216261271. The reversal of 1216261230 is 321626121.

It is a super-2 number, since 2×1216261230² = 2958582759202225800, which contains 22 as substring.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 1216261230.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 20270991 + ... + 20271050.

It is an arithmetic number, because the mean of its divisors is an integer number (182439189).

Almost surely, 2^1216261230 is an apocalyptic number.

1216261230 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1216261230 is an abundant number, since it is smaller than the sum of its proper divisors (1702765794).

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

1216261230 is a wasteful number, since it uses less digits than its factorization.

1216261230 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40542051.

The product of its (nonzero) digits is 864, while the sum is 24.

The square root of 1216261230 is about 34874.9369891904. The cubic root of 1216261230 is about 1067.4370867533.

Adding to 1216261230 its reverse (321626121), we get a palindrome (1537887351).

The spelling of 1216261230 in words is "one billion, two hundred sixteen million, two hundred sixty-one thousand, two hundred thirty".