1216831241 has 2 divisors, whose sum is σ = 1216831242. Its totient is φ = 1216831240.

The previous prime is 1216831237. The next prime is 1216831267. The reversal of 1216831241 is 1421386121.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 616777225 + 600054016 = 24835^2 + 24496^2 .

It is a cyclic number.

It is not a de Polignac number, because 1216831241 - 2² = 1216831237 is a prime.

It is not a weakly prime, because it can be changed into another prime (1216831541) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 608415620 + 608415621.

It is an arithmetic number, because the mean of its divisors is an integer number (608415621).

Almost surely, 2^1216831241 is an apocalyptic number.

It is an amenable number.

1216831241 is a deficient number, since it is larger than the sum of its proper divisors (1).

1216831241 is an equidigital number, since it uses as much as digits as its factorization.

1216831241 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2304, while the sum is 29.

The square root of 1216831241 is about 34883.1082474025. The cubic root of 1216831241 is about 1067.6038151499.

The spelling of 1216831241 in words is "one billion, two hundred sixteen million, eight hundred thirty-one thousand, two hundred forty-one".