999442082381 has 2 divisors, whose sum is σ = 999442082382. Its totient is φ = 999442082380.

The previous prime is 999442082357. The next prime is 999442082399. The reversal of 999442082381 is 183280244999.

999442082381 = 706909² + 706910².

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 499721748100 + 499720334281 = 706910^2 + 706909^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-999442082381 is a prime.

It is a super-2 number, since 2×999442082381² (a number of 25 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 999442082381.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (999442082341) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 499721041190 + 499721041191.

It is an arithmetic number, because the mean of its divisors is an integer number (499721041191).

Almost surely, 2^999442082381 is an apocalyptic number.

999442082381 is the 706910-th centered square number.

It is an amenable number.

999442082381 is a deficient number, since it is larger than the sum of its proper divisors (1).

999442082381 is an equidigital number, since it uses as much as digits as its factorization.

999442082381 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 8957952, while the sum is 59.

The spelling of 999442082381 in words is "nine hundred ninety-nine billion, four hundred forty-two million, eighty-two thousand, three hundred eighty-one".