1221446461 has 4 divisors (see below), whose sum is σ = 1223934624. Its totient is φ = 1218958300.

The previous prime is 1221446459. The next prime is 1221446477. The reversal of 1221446461 is 1646441221.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1221446461 - 2¹ = 1221446459 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 (1221446431) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1243345 + ... + 1244326.

It is an arithmetic number, because the mean of its divisors is an integer number (305983656).

Almost surely, 2^1221446461 is an apocalyptic number.

It is an amenable number.

1221446461 is a deficient number, since it is larger than the sum of its proper divisors (2488163).

1221446461 is an equidigital number, since it uses as much as digits as its factorization.

1221446461 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2488162.

The product of its digits is 9216, while the sum is 31.

The square root of 1221446461 is about 34949.1982883728. The cubic root of 1221446461 is about 1068.9518547817.

Adding to 1221446461 its reverse (1646441221), we get a palindrome (2867887682).

The spelling of 1221446461 in words is "one billion, two hundred twenty-one million, four hundred forty-six thousand, four hundred sixty-one".