623554961 has 2 divisors, whose sum is σ = 623554962. Its totient is φ = 623554960.

The previous prime is 623554889. The next prime is 623555041. The reversal of 623554961 is 169455326.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 359329936 + 264225025 = 18956^2 + 16255^2 .

It is a cyclic number.

It is not a de Polignac number, because 623554961 - 2¹⁰ = 623553937 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (623553961) 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, 311777480 + 311777481.

It is an arithmetic number, because the mean of its divisors is an integer number (311777481).

Almost surely, 2^623554961 is an apocalyptic number.

It is an amenable number.

623554961 is a deficient number, since it is larger than the sum of its proper divisors (1).

623554961 is an equidigital number, since it uses as much as digits as its factorization.

623554961 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 194400, while the sum is 41.

The square root of 623554961 is about 24971.0824955587. The cubic root of 623554961 is about 854.3285363419.

The spelling of 623554961 in words is "six hundred twenty-three million, five hundred fifty-four thousand, nine hundred sixty-one".