623305531 has 2 divisors, whose sum is σ = 623305532. Its totient is φ = 623305530.

The previous prime is 623305481. The next prime is 623305541. The reversal of 623305531 is 135503326.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 623305531 - 2¹⁷ = 623174459 is a prime.

It is a super-2 number, since 2×623305531² = 777019569950383922, which contains 22 as substring.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 623305531.

It is not a weakly prime, because it can be changed into another prime (623305541) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 311652765 + 311652766.

It is an arithmetic number, because the mean of its divisors is an integer number (311652766).

Almost surely, 2^623305531 is an apocalyptic number.

623305531 is a deficient number, since it is larger than the sum of its proper divisors (1).

623305531 is an equidigital number, since it uses as much as digits as its factorization.

623305531 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 8100, while the sum is 28.

The square root of 623305531 is about 24966.0876190083. The cubic root of 623305531 is about 854.2146070173.

Adding to 623305531 its reverse (135503326), we get a palindrome (758808857).

The spelling of 623305531 in words is "six hundred twenty-three million, three hundred five thousand, five hundred thirty-one".