1216146977 has 2 divisors, whose sum is σ = 1216146978. Its totient is φ = 1216146976.

The previous prime is 1216146839. The next prime is 1216146989. The reversal of 1216146977 is 7796416121.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 813903841 + 402243136 = 28529^2 + 20056^2 .

It is a cyclic number.

It is not a de Polignac number, because 1216146977 - 2⁸ = 1216146721 is a prime.

It is not a weakly prime, because it can be changed into another prime (1216146077) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 608073488 + 608073489.

It is an arithmetic number, because the mean of its divisors is an integer number (608073489).

Almost surely, 2^1216146977 is an apocalyptic number.

It is an amenable number.

1216146977 is a deficient number, since it is larger than the sum of its proper divisors (1).

1216146977 is an equidigital number, since it uses as much as digits as its factorization.

1216146977 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 127008, while the sum is 44.

The square root of 1216146977 is about 34873.2989119183. The cubic root of 1216146977 is about 1067.4036614481.

The spelling of 1216146977 in words is "one billion, two hundred sixteen million, one hundred forty-six thousand, nine hundred seventy-seven".