999620659 has 2 divisors, whose sum is σ = 999620660. Its totient is φ = 999620658.

The previous prime is 999620653. The next prime is 999620663. The reversal of 999620659 is 956026999.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 999620659 - 2²¹ = 997523507 is a prime.

It is not a weakly prime, because it can be changed into another prime (999620653) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 499810329 + 499810330.

It is an arithmetic number, because the mean of its divisors is an integer number (499810330).

Almost surely, 2^999620659 is an apocalyptic number.

999620659 is a deficient number, since it is larger than the sum of its proper divisors (1).

999620659 is an equidigital number, since it uses as much as digits as its factorization.

999620659 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2361960, while the sum is 55.

The square root of 999620659 is about 31616.7781249134. The cubic root of 999620659 is about 999.8735370078.

The spelling of 999620659 in words is "nine hundred ninety-nine million, six hundred twenty thousand, six hundred fifty-nine".