999644153 has 2 divisors, whose sum is σ = 999644154. Its totient is φ = 999644152.

The previous prime is 999644071. The next prime is 999644161. The reversal of 999644153 is 351446999.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 549058624 + 450585529 = 23432^2 + 21227^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-999644153 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (999644053) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 499822076 + 499822077.

It is an arithmetic number, because the mean of its divisors is an integer number (499822077).

Almost surely, 2^999644153 is an apocalyptic number.

It is an amenable number.

999644153 is a deficient number, since it is larger than the sum of its proper divisors (1).

999644153 is an equidigital number, since it uses as much as digits as its factorization.

999644153 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1049760, while the sum is 50.

The square root of 999644153 is about 31617.1496659645. The cubic root of 999644153 is about 999.8813702609.

The spelling of 999644153 in words is "nine hundred ninety-nine million, six hundred forty-four thousand, one hundred fifty-three".