1155421039 has 2 divisors, whose sum is σ = 1155421040. Its totient is φ = 1155421038.

The previous prime is 1155421009. The next prime is 1155421049. The reversal of 1155421039 is 9301245511.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1155421039 - 2⁹ = 1155420527 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1155421039.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1155421009) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 577710519 + 577710520.

It is an arithmetic number, because the mean of its divisors is an integer number (577710520).

Almost surely, 2^1155421039 is an apocalyptic number.

1155421039 is a deficient number, since it is larger than the sum of its proper divisors (1).

1155421039 is an equidigital number, since it uses as much as digits as its factorization.

1155421039 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5400, while the sum is 31.

The square root of 1155421039 is about 33991.4848013440. The cubic root of 1155421039 is about 1049.3332241384. Note that the first 3 decimals are identical.

The spelling of 1155421039 in words is "one billion, one hundred fifty-five million, four hundred twenty-one thousand, thirty-nine".