623411681 has 2 divisors, whose sum is σ = 623411682. Its totient is φ = 623411680.

The previous prime is 623411627. The next prime is 623411687. The reversal of 623411681 is 186114326.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 588790225 + 34621456 = 24265^2 + 5884^2 .

It is a cyclic number.

It is not a de Polignac number, because 623411681 - 2²² = 619217377 is a prime.

It is a super-2 number, since 2×623411681² = 777284248014491522, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (623411687) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 311705840 + 311705841.

It is an arithmetic number, because the mean of its divisors is an integer number (311705841).

Almost surely, 2^623411681 is an apocalyptic number.

It is an amenable number.

623411681 is a deficient number, since it is larger than the sum of its proper divisors (1).

623411681 is an equidigital number, since it uses as much as digits as its factorization.

623411681 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6912, while the sum is 32.

The square root of 623411681 is about 24968.2134122568. The cubic root of 623411681 is about 854.2630956686.

The spelling of 623411681 in words is "six hundred twenty-three million, four hundred eleven thousand, six hundred eighty-one".