1221255463 has 2 divisors, whose sum is σ = 1221255464. Its totient is φ = 1221255462.

The previous prime is 1221255437. The next prime is 1221255467. The reversal of 1221255463 is 3645521221.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1221255463 - 2¹⁷ = 1221124391 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1221255467) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 610627731 + 610627732.

It is an arithmetic number, because the mean of its divisors is an integer number (610627732).

Almost surely, 2^1221255463 is an apocalyptic number.

1221255463 is a deficient number, since it is larger than the sum of its proper divisors (1).

1221255463 is an equidigital number, since it uses as much as digits as its factorization.

1221255463 is an evil number, because the sum of its binary digits is even.

The product of its digits is 14400, while the sum is 31.

The square root of 1221255463 is about 34946.4656725111. The cubic root of 1221255463 is about 1068.8961344218.

Adding to 1221255463 its reverse (3645521221), we get a palindrome (4866776684).

The spelling of 1221255463 in words is "one billion, two hundred twenty-one million, two hundred fifty-five thousand, four hundred sixty-three".