623572217 has 2 divisors, whose sum is σ = 623572218. Its totient is φ = 623572216.

The previous prime is 623572199. The next prime is 623572219. The reversal of 623572217 is 712275326.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 598731961 + 24840256 = 24469^2 + 4984^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-623572217 is a prime.

Together with 623572219, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (623572219) 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, 311786108 + 311786109.

It is an arithmetic number, because the mean of its divisors is an integer number (311786109).

Almost surely, 2^623572217 is an apocalyptic number.

It is an amenable number.

623572217 is a deficient number, since it is larger than the sum of its proper divisors (1).

623572217 is an equidigital number, since it uses as much as digits as its factorization.

623572217 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 35280, while the sum is 35.

The square root of 623572217 is about 24971.4280128310. The cubic root of 623572217 is about 854.3364170464.

The spelling of 623572217 in words is "six hundred twenty-three million, five hundred seventy-two thousand, two hundred seventeen".