1216970777 has 8 divisors (see below), whose sum is σ = 1330633920. Its totient is φ = 1103812560.

The previous prime is 1216970753. The next prime is 1216970837. The reversal of 1216970777 is 7770796121.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1216970777 - 2¹⁶ = 1216905241 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1216970707) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 121178 + ... + 130835.

It is an arithmetic number, because the mean of its divisors is an integer number (166329240).

Almost surely, 2^1216970777 is an apocalyptic number.

It is an amenable number.

1216970777 is a deficient number, since it is larger than the sum of its proper divisors (113663143).

1216970777 is a wasteful number, since it uses less digits than its factorization.

1216970777 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 252463.

The product of its (nonzero) digits is 259308, while the sum is 47.

The square root of 1216970777 is about 34885.1082411966. The cubic root of 1216970777 is about 1067.6446215403.

The spelling of 1216970777 in words is "one billion, two hundred sixteen million, nine hundred seventy thousand, seven hundred seventy-seven".