1216043325 has 36 divisors (see below), whose sum is σ = 2489224608. Its totient is φ = 555904800.

The previous prime is 1216043261. The next prime is 1216043347. The reversal of 1216043325 is 5233406121.

1216043325 is a `hidden beast` number, since 1 + 2 + 1 + 604 + 33 + 25 = 666.

It is not a de Polignac number, because 1216043325 - 2⁶ = 1216043261 is a prime.

It is a super-2 number, since 2×1216043325² = 2957522736554111250, which contains 22 as substring.

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 35 ways as a sum of consecutive naturals, for example, 384471 + ... + 387620.

It is an arithmetic number, because the mean of its divisors is an integer number (69145128).

Almost surely, 2^1216043325 is an apocalyptic number.

1216043325 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1216043325 is an abundant number, since it is smaller than the sum of its proper divisors (1273181283).

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

1216043325 is a wasteful number, since it uses less digits than its factorization.

1216043325 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 772114 (or 772106 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 27.

The square root of 1216043325 is about 34871.8127575840. The cubic root of 1216043325 is about 1067.3733357090.

Adding to 1216043325 its reverse (5233406121), we get a palindrome (6449449446).

The spelling of 1216043325 in words is "one billion, two hundred sixteen million, forty-three thousand, three hundred twenty-five".