623009551 has 2 divisors, whose sum is σ = 623009552. Its totient is φ = 623009550.

The previous prime is 623009509. The next prime is 623009561. The reversal of 623009551 is 155900326.

623009551 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 623009551 - 2¹³ = 623001359 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (623009561) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 311504775 + 311504776.

It is an arithmetic number, because the mean of its divisors is an integer number (311504776).

Almost surely, 2^623009551 is an apocalyptic number.

623009551 is a deficient number, since it is larger than the sum of its proper divisors (1).

623009551 is an equidigital number, since it uses as much as digits as its factorization.

623009551 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 8100, while the sum is 31.

The square root of 623009551 is about 24960.1592743316. The cubic root of 623009551 is about 854.0793761357.

Adding to 623009551 its reverse (155900326), we get a palindrome (778909877).

The spelling of 623009551 in words is "six hundred twenty-three million, nine thousand, five hundred fifty-one".