1301221663 has 4 divisors (see below), whose sum is σ = 1487110480. Its totient is φ = 1115332848.

The previous prime is 1301221657. The next prime is 1301221687. The reversal of 1301221663 is 3661221031.

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

It is a de Polignac number, because none of the positive numbers 2^k-1301221663 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 (1301221613) 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, 92944398 + ... + 92944411.

It is an arithmetic number, because the mean of its divisors is an integer number (371777620).

Almost surely, 2^1301221663 is an apocalyptic number.

1301221663 is a deficient number, since it is larger than the sum of its proper divisors (185888817).

1301221663 is an equidigital number, since it uses as much as digits as its factorization.

1301221663 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 185888816.

The product of its (nonzero) digits is 1296, while the sum is 25.

The square root of 1301221663 is about 36072.4501940193. The cubic root of 1301221663 is about 1091.7346514880.

Adding to 1301221663 its reverse (3661221031), we get a palindrome (4962442694).

The spelling of 1301221663 in words is "one billion, three hundred one million, two hundred twenty-one thousand, six hundred sixty-three".