623411531 has 4 divisors (see below), whose sum is σ = 629838552. Its totient is φ = 616984512.

The previous prime is 623411497. The next prime is 623411533. The reversal of 623411531 is 135114326.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 623411531 - 2¹⁴ = 623395147 is a prime.

It is a super-2 number, since 2×623411531² = 777283873967527922, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 623411531.

It is not an unprimeable number, because it can be changed into a prime (623411533) 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 in 3 ways as a sum of consecutive naturals, for example, 3213365 + ... + 3213558.

It is an arithmetic number, because the mean of its divisors is an integer number (157459638).

Almost surely, 2^623411531 is an apocalyptic number.

623411531 is a deficient number, since it is larger than the sum of its proper divisors (6427021).

623411531 is an equidigital number, since it uses as much as digits as its factorization.

623411531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6427020.

The product of its digits is 2160, while the sum is 26.

The square root of 623411531 is about 24968.2104084374. The cubic root of 623411531 is about 854.2630271534.

Adding to 623411531 its reverse (135114326), we get a palindrome (758525857).

The spelling of 623411531 in words is "six hundred twenty-three million, four hundred eleven thousand, five hundred thirty-one".