1216831125 has 32 divisors (see below), whose sum is σ = 2027480832. Its totient is φ = 648120000.

The previous prime is 1216831103. The next prime is 1216831129. The reversal of 1216831125 is 5211386121.

It is not a de Polignac number, because 1216831125 - 2⁵ = 1216831093 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1216831092 and 1216831101.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1216831129) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 366975 + ... + 370275.

It is an arithmetic number, because the mean of its divisors is an integer number (63358776).

Almost surely, 2^1216831125 is an apocalyptic number.

1216831125 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1216831125 is a deficient number, since it is larger than the sum of its proper divisors (810649707).

1216831125 is an equidigital number, since it uses as much as digits as its factorization.

1216831125 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4302 (or 4292 counting only the distinct ones).

The product of its digits is 2880, while the sum is 30.

The square root of 1216831125 is about 34883.1065847066. The cubic root of 1216831125 is about 1067.6037812251.

The spelling of 1216831125 in words is "one billion, two hundred sixteen million, eight hundred thirty-one thousand, one hundred twenty-five".