999955457 has 2 divisors, whose sum is σ = 999955458. Its totient is φ = 999955456.

The previous prime is 999955433. The next prime is 999955469. The reversal of 999955457 is 754559999.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 553943296 + 446012161 = 23536^2 + 21119^2 .

It is an emirp because it is prime and its reverse (754559999) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 999955457 - 2⁶ = 999955393 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 999955457.

It is not a weakly prime, because it can be changed into another prime (999955417) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 499977728 + 499977729.

It is an arithmetic number, because the mean of its divisors is an integer number (499977729).

Almost surely, 2^999955457 is an apocalyptic number.

It is an amenable number.

999955457 is a deficient number, since it is larger than the sum of its proper divisors (1).

999955457 is an equidigital number, since it uses as much as digits as its factorization.

999955457 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 22963500, while the sum is 62.

The square root of 999955457 is about 31622.0723071718. The cubic root of 999955457 is about 999.9851521129.

It can be divided in two parts, 9999 and 55457, that added together give a palindrome (65456).

The spelling of 999955457 in words is "nine hundred ninety-nine million, nine hundred fifty-five thousand, four hundred fifty-seven".