1216988177 has 2 divisors, whose sum is σ = 1216988178. Its totient is φ = 1216988176.

The previous prime is 1216988159. The next prime is 1216988203. The reversal of 1216988177 is 7718896121.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1065304321 + 151683856 = 32639^2 + 12316^2 .

It is a cyclic number.

It is not a de Polignac number, because 1216988177 - 2⁸ = 1216987921 is a prime.

It is not a weakly prime, because it can be changed into another prime (1216988137) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 608494088 + 608494089.

It is an arithmetic number, because the mean of its divisors is an integer number (608494089).

Almost surely, 2^1216988177 is an apocalyptic number.

It is an amenable number.

1216988177 is a deficient number, since it is larger than the sum of its proper divisors (1).

1216988177 is an equidigital number, since it uses as much as digits as its factorization.

1216988177 is an evil number, because the sum of its binary digits is even.

The product of its digits is 338688, while the sum is 50.

The square root of 1216988177 is about 34885.3576303870. The cubic root of 1216988177 is about 1067.6497098378.

The spelling of 1216988177 in words is "one billion, two hundred sixteen million, nine hundred eighty-eight thousand, one hundred seventy-seven".