1153021999 has 2 divisors, whose sum is σ = 1153022000. Its totient is φ = 1153021998.

The previous prime is 1153021997. The next prime is 1153022021. The reversal of 1153021999 is 9991203511.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1153021999 - 2¹ = 1153021997 is a prime.

Together with 1153021997, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1153021997) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 576510999 + 576511000.

It is an arithmetic number, because the mean of its divisors is an integer number (576511000).

Almost surely, 2^1153021999 is an apocalyptic number.

1153021999 is a deficient number, since it is larger than the sum of its proper divisors (1).

1153021999 is an equidigital number, since it uses as much as digits as its factorization.

1153021999 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 21870, while the sum is 40.

The square root of 1153021999 is about 33956.1776264644. The cubic root of 1153021999 is about 1048.6064654876.

The spelling of 1153021999 in words is "one billion, one hundred fifty-three million, twenty-one thousand, nine hundred ninety-nine".