1220912563 has 4 divisors (see below), whose sum is σ = 1314828928. Its totient is φ = 1126996200.

The previous prime is 1220912551. The next prime is 1220912593. The reversal of 1220912563 is 3652190221.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1220912563 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1220912593) 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, 46958163 + ... + 46958188.

It is an arithmetic number, because the mean of its divisors is an integer number (328707232).

Almost surely, 2^1220912563 is an apocalyptic number.

1220912563 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

1220912563 is a deficient number, since it is larger than the sum of its proper divisors (93916365).

1220912563 is an equidigital number, since it uses as much as digits as its factorization.

1220912563 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 93916364.

The product of its (nonzero) digits is 6480, while the sum is 31.

The square root of 1220912563 is about 34941.5592525577. The cubic root of 1220912563 is about 1068.7960847039.

The spelling of 1220912563 in words is "one billion, two hundred twenty million, nine hundred twelve thousand, five hundred sixty-three".