981623 has 2 divisors, whose sum is σ = 981624. Its totient is φ = 981622.

The previous prime is 981601. The next prime is 981637. The reversal of 981623 is 326189.

It is a strong prime.

It is an emirp because it is prime and its reverse (326189) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 981623 - 2¹⁰ = 980599 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (981653) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 490811 + 490812.

It is an arithmetic number, because the mean of its divisors is an integer number (490812).

2⁹⁸¹⁶²³ is an apocalyptic number.

981623 is a deficient number, since it is larger than the sum of its proper divisors (1).

981623 is an equidigital number, since it uses as much as digits as its factorization.

981623 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2592, while the sum is 29.

The square root of 981623 is about 990.7688933349. The cubic root of 981623 is about 99.3836421687.

The spelling of 981623 in words is "nine hundred eighty-one thousand, six hundred twenty-three".