1216634357 has 2 divisors, whose sum is σ = 1216634358. Its totient is φ = 1216634356.

The previous prime is 1216634351. The next prime is 1216634383. The reversal of 1216634357 is 7534366121.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1155388081 + 61246276 = 33991^2 + 7826^2 .

It is an emirp because it is prime and its reverse (7534366121) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1216634357 - 2¹⁰ = 1216633333 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1216634357.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1216634351) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 608317178 + 608317179.

It is an arithmetic number, because the mean of its divisors is an integer number (608317179).

Almost surely, 2^1216634357 is an apocalyptic number.

It is an amenable number.

1216634357 is a deficient number, since it is larger than the sum of its proper divisors (1).

1216634357 is an equidigital number, since it uses as much as digits as its factorization.

1216634357 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 90720, while the sum is 38.

The square root of 1216634357 is about 34880.2860796754. The cubic root of 1216634357 is about 1067.5462324055.

The spelling of 1216634357 in words is "one billion, two hundred sixteen million, six hundred thirty-four thousand, three hundred fifty-seven".