999621353 has 2 divisors, whose sum is σ = 999621354. Its totient is φ = 999621352.

The previous prime is 999621323. The next prime is 999621379. The reversal of 999621353 is 353126999.

999621353 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 887324944 + 112296409 = 29788^2 + 10597^2 .

It is an emirp because it is prime and its reverse (353126999) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 999621353 - 2¹⁰ = 999620329 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 999621298 and 999621307.

It is not a weakly prime, because it can be changed into another prime (999621313) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 499810676 + 499810677.

It is an arithmetic number, because the mean of its divisors is an integer number (499810677).

Almost surely, 2^999621353 is an apocalyptic number.

It is an amenable number.

999621353 is a deficient number, since it is larger than the sum of its proper divisors (1).

999621353 is an equidigital number, since it uses as much as digits as its factorization.

999621353 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 393660, while the sum is 47.

The square root of 999621353 is about 31616.7891000968. The cubic root of 999621353 is about 999.8737683996.

The spelling of 999621353 in words is "nine hundred ninety-nine million, six hundred twenty-one thousand, three hundred fifty-three".