1222977209689 has 3 divisors (see below), whose sum is σ = 1222978315573. Its totient is φ = 1222976103806.

The previous prime is 1222977209609. The next prime is 1222977209731. The reversal of 1222977209689 is 9869027792221.

The square root of 1222977209689 is 1105883.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is not a de Polignac number, because 1222977209689 - 2¹⁵ = 1222977176921 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1222977209689.

It is not an unprimeable number, because it can be changed into a prime (1222977209609) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 552942 + ... + 1658824.

Almost surely, 2^{1222977209689} is an apocalyptic number.

1222977209689 is the 1105883-rd square number.

1222977209689 is the 552942-nd centered octagonal number.

It is an amenable number.

1222977209689 is a deficient number, since it is larger than the sum of its proper divisors (1105884).

1222977209689 is an frugal number, since it uses more digits than its factorization.

1222977209689 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2211766 (or 1105883 counting only the distinct ones).

The product of its (nonzero) digits is 27433728, while the sum is 64.

Multiplying 1222977209689 by its sum of digits (64), we get a square (78270541420096 = 8847064²).

The spelling of 1222977209689 in words is "one trillion, two hundred twenty-two billion, nine hundred seventy-seven million, two hundred nine thousand, six hundred eighty-nine".