1220264999 has 4 divisors (see below), whose sum is σ = 1232112336. Its totient is φ = 1208417664.

The previous prime is 1220264989. The next prime is 1220265019. The reversal of 1220264999 is 9994620221.

1220264999 is nontrivially palindromic in base 5.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1220264999 - 2¹² = 1220260903 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1220264939) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5923514 + ... + 5923719.

It is an arithmetic number, because the mean of its divisors is an integer number (308028084).

Almost surely, 2^1220264999 is an apocalyptic number.

1220264999 is a deficient number, since it is larger than the sum of its proper divisors (11847337).

1220264999 is a wasteful number, since it uses less digits than its factorization.

1220264999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11847336.

The product of its (nonzero) digits is 139968, while the sum is 44.

The square root of 1220264999 is about 34932.2916368222. The cubic root of 1220264999 is about 1068.6070904796.

The spelling of 1220264999 in words is "one billion, two hundred twenty million, two hundred sixty-four thousand, nine hundred ninety-nine".