1221455041 has 2 divisors, whose sum is σ = 1221455042. Its totient is φ = 1221455040.

The previous prime is 1221455029. The next prime is 1221455047. The reversal of 1221455041 is 1405541221.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1197160000 + 24295041 = 34600^2 + 4929^2 .

It is a cyclic number.

It is not a de Polignac number, because 1221455041 - 2²⁷ = 1087237313 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1221454997 and 1221455015.

It is not a weakly prime, because it can be changed into another prime (1221455047) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 610727520 + 610727521.

It is an arithmetic number, because the mean of its divisors is an integer number (610727521).

Almost surely, 2^1221455041 is an apocalyptic number.

It is an amenable number.

1221455041 is a deficient number, since it is larger than the sum of its proper divisors (1).

1221455041 is an equidigital number, since it uses as much as digits as its factorization.

1221455041 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1600, while the sum is 25.

The square root of 1221455041 is about 34949.3210377541. The cubic root of 1221455041 is about 1068.9543577118.

Adding to 1221455041 its reverse (1405541221), we get a palindrome (2626996262).

The spelling of 1221455041 in words is "one billion, two hundred twenty-one million, four hundred fifty-five thousand, forty-one".