999620623 has 2 divisors, whose sum is σ = 999620624. Its totient is φ = 999620622.

The previous prime is 999620563. The next prime is 999620653. The reversal of 999620623 is 326026999.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-999620623 is a prime.

It is a congruent number.

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, 499810311 + 499810312.

It is an arithmetic number, because the mean of its divisors is an integer number (499810312).

Almost surely, 2^999620623 is an apocalyptic number.

999620623 is a deficient number, since it is larger than the sum of its proper divisors (1).

999620623 is an equidigital number, since it uses as much as digits as its factorization.

999620623 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 314928, while the sum is 46.

The square root of 999620623 is about 31616.7775555954. Note that the first 3 decimals coincide. The cubic root of 999620623 is about 999.8735250047.

The spelling of 999620623 in words is "nine hundred ninety-nine million, six hundred twenty thousand, six hundred twenty-three".