999561203 has 2 divisors, whose sum is σ = 999561204. Its totient is φ = 999561202.

The previous prime is 999561197. The next prime is 999561259. The reversal of 999561203 is 302165999.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-999561203 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (999563203) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 499780601 + 499780602.

It is an arithmetic number, because the mean of its divisors is an integer number (499780602).

Almost surely, 2^999561203 is an apocalyptic number.

999561203 is a deficient number, since it is larger than the sum of its proper divisors (1).

999561203 is an equidigital number, since it uses as much as digits as its factorization.

999561203 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 131220, while the sum is 44.

The square root of 999561203 is about 31615.8378506722. The cubic root of 999561203 is about 999.8537129345.

The spelling of 999561203 in words is "nine hundred ninety-nine million, five hundred sixty-one thousand, two hundred three".