997959623 has 2 divisors, whose sum is σ = 997959624. Its totient is φ = 997959622.

The previous prime is 997959577. The next prime is 997959647. The reversal of 997959623 is 326959799.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 997959623 - 2⁸ = 997959367 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (997952623) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 498979811 + 498979812.

It is an arithmetic number, because the mean of its divisors is an integer number (498979812).

Almost surely, 2^997959623 is an apocalyptic number.

997959623 is a deficient number, since it is larger than the sum of its proper divisors (1).

997959623 is an equidigital number, since it uses as much as digits as its factorization.

997959623 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 8266860, while the sum is 59.

The square root of 997959623 is about 31590.4989355977. The cubic root of 997959623 is about 999.3194112374.

The spelling of 997959623 in words is "nine hundred ninety-seven million, nine hundred fifty-nine thousand, six hundred twenty-three".