1221054539 has 2 divisors, whose sum is σ = 1221054540. Its totient is φ = 1221054538.

The previous prime is 1221054517. The next prime is 1221054557. The reversal of 1221054539 is 9354501221.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1221054539 - 2¹² = 1221050443 is a prime.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (1221054239) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 610527269 + 610527270.

It is an arithmetic number, because the mean of its divisors is an integer number (610527270).

Almost surely, 2^1221054539 is an apocalyptic number.

1221054539 is a deficient number, since it is larger than the sum of its proper divisors (1).

1221054539 is an equidigital number, since it uses as much as digits as its factorization.

1221054539 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 10800, while the sum is 32.

The square root of 1221054539 is about 34943.5908143396. The cubic root of 1221054539 is about 1068.8375120525.

The spelling of 1221054539 in words is "one billion, two hundred twenty-one million, fifty-four thousand, five hundred thirty-nine".