999381653 has 2 divisors, whose sum is σ = 999381654. Its totient is φ = 999381652.

The previous prime is 999381641. The next prime is 999381659. The reversal of 999381653 is 356183999.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 803325649 + 196056004 = 28343^2 + 14002^2 .

It is an emirp because it is prime and its reverse (356183999) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 999381653 - 2⁴ = 999381637 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 999381595 and 999381604.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (999381659) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 499690826 + 499690827.

It is an arithmetic number, because the mean of its divisors is an integer number (499690827).

Almost surely, 2^999381653 is an apocalyptic number.

It is an amenable number.

999381653 is a deficient number, since it is larger than the sum of its proper divisors (1).

999381653 is an equidigital number, since it uses as much as digits as its factorization.

999381653 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1574640, while the sum is 53.

The square root of 999381653 is about 31612.9981653117. The cubic root of 999381653 is about 999.7938418351.

The spelling of 999381653 in words is "nine hundred ninety-nine million, three hundred eighty-one thousand, six hundred fifty-three".