1221545383 has 2 divisors, whose sum is σ = 1221545384. Its totient is φ = 1221545382.

The previous prime is 1221545363. The next prime is 1221545441. The reversal of 1221545383 is 3835451221.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1221545383 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1221545323) 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 as a sum of consecutive naturals, namely, 610772691 + 610772692.

It is an arithmetic number, because the mean of its divisors is an integer number (610772692).

Almost surely, 2^1221545383 is an apocalyptic number.

1221545383 is a deficient number, since it is larger than the sum of its proper divisors (1).

1221545383 is an equidigital number, since it uses as much as digits as its factorization.

1221545383 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 28800, while the sum is 34.

The square root of 1221545383 is about 34950.6134853167. The cubic root of 1221545383 is about 1068.9807112793.

The spelling of 1221545383 in words is "one billion, two hundred twenty-one million, five hundred forty-five thousand, three hundred eighty-three".