623553979 has 2 divisors, whose sum is σ = 623553980. Its totient is φ = 623553978.

The previous prime is 623553961. The next prime is 623554073. The reversal of 623553979 is 979355326.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 623553979 - 2¹³ = 623545787 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (623553179) 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, 311776989 + 311776990.

It is an arithmetic number, because the mean of its divisors is an integer number (311776990).

Almost surely, 2^623553979 is an apocalyptic number.

623553979 is a deficient number, since it is larger than the sum of its proper divisors (1).

623553979 is an equidigital number, since it uses as much as digits as its factorization.

623553979 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1530900, while the sum is 49.

The square root of 623553979 is about 24971.0628328071. The cubic root of 623553979 is about 854.3280878644.

The spelling of 623553979 in words is "six hundred twenty-three million, five hundred fifty-three thousand, nine hundred seventy-nine".