623531 has 2 divisors, whose sum is σ = 623532. Its totient is φ = 623530.

The previous prime is 623521. The next prime is 623537. The reversal of 623531 is 135326.

623531 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 623531 - 2¹⁴ = 607147 is a prime.

It is a super-2 number, since 2×623531² = 777581815922, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Chen prime.

It is an Ulam number.

It is a plaindrome in base 14.

It is not a weakly prime, because it can be changed into another prime (623537) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 311765 + 311766.

It is an arithmetic number, because the mean of its divisors is an integer number (311766).

2⁶²³⁵³¹ is an apocalyptic number.

623531 is a deficient number, since it is larger than the sum of its proper divisors (1).

623531 is an equidigital number, since it uses as much as digits as its factorization.

623531 is an evil number, because the sum of its binary digits is even.

The product of its digits is 540, while the sum is 20.

The square root of 623531 is about 789.6397912973. The cubic root of 623531 is about 85.4317593266.

Adding to 623531 its reverse (135326), we get a palindrome (758857).

The spelling of 623531 in words is "six hundred twenty-three thousand, five hundred thirty-one".