1021599499 has 2 divisors, whose sum is σ = 1021599500. Its totient is φ = 1021599498.

The previous prime is 1021599497. The next prime is 1021599503. The reversal of 1021599499 is 9949951201.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1021599499 - 2¹ = 1021599497 is a prime.

Together with 1021599497, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (1021599493) 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, 510799749 + 510799750.

It is an arithmetic number, because the mean of its divisors is an integer number (510799750).

Almost surely, 2^1021599499 is an apocalyptic number.

1021599499 is a deficient number, since it is larger than the sum of its proper divisors (1).

1021599499 is an equidigital number, since it uses as much as digits as its factorization.

1021599499 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 262440, while the sum is 49.

The square root of 1021599499 is about 31962.4701642411. The cubic root of 1021599499 is about 1007.1486086239.

The spelling of 1021599499 in words is "one billion, twenty-one million, five hundred ninety-nine thousand, four hundred ninety-nine".