623521441 has 2 divisors, whose sum is σ = 623521442. Its totient is φ = 623521440.

The previous prime is 623521369. The next prime is 623521463. The reversal of 623521441 is 144125326.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 623001600 + 519841 = 24960^2 + 721^2 .

It is a cyclic number.

It is not a de Polignac number, because 623521441 - 2¹³ = 623513249 is a prime.

It is a super-3 number, since 3×623521441³ (a number of 27 digits) contains 333 as substring.

It is not a weakly prime, because it can be changed into another prime (623521541) 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, 311760720 + 311760721.

It is an arithmetic number, because the mean of its divisors is an integer number (311760721).

Almost surely, 2^623521441 is an apocalyptic number.

It is an amenable number.

623521441 is a deficient number, since it is larger than the sum of its proper divisors (1).

623521441 is an equidigital number, since it uses as much as digits as its factorization.

623521441 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5760, while the sum is 28.

The square root of 623521441 is about 24970.4113101887. The cubic root of 623521441 is about 854.3132275573.

Adding to 623521441 its reverse (144125326), we get a palindrome (767646767).

The spelling of 623521441 in words is "six hundred twenty-three million, five hundred twenty-one thousand, four hundred forty-one".