1000121623 has 2 divisors, whose sum is σ = 1000121624. Its totient is φ = 1000121622.

The previous prime is 1000121621. The next prime is 1000121641. The reversal of 1000121623 is 3261210001.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1000121623 - 2¹ = 1000121621 is a prime.

Together with 1000121621, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 1000121597 and 1000121606.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1000121621) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 500060811 + 500060812.

It is an arithmetic number, because the mean of its divisors is an integer number (500060812).

Almost surely, 2^1000121623 is an apocalyptic number.

1000121623 is a deficient number, since it is larger than the sum of its proper divisors (1).

1000121623 is an equidigital number, since it uses as much as digits as its factorization.

1000121623 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 72, while the sum is 16.

The square root of 1000121623 is about 31624.6995716955. The cubic root of 1000121623 is about 1000.0405393565.

Adding to 1000121623 its reverse (3261210001), we get a palindrome (4261331624).

The spelling of 1000121623 in words is "one billion, one hundred twenty-one thousand, six hundred twenty-three".