6623531 has 2 divisors, whose sum is σ = 6623532. Its totient is φ = 6623530.

The previous prime is 6623521. The next prime is 6623549. The reversal of 6623531 is 1353266.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 6623531 - 2⁶ = 6623467 is a prime.

It is a super-2 number, since 2×6623531² = 87742325815922, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 6623531.

It is not a weakly prime, because it can be changed into another prime (6623521) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3311765 + 3311766.

It is an arithmetic number, because the mean of its divisors is an integer number (3311766).

Almost surely, 2^6623531 is an apocalyptic number.

6623531 is a deficient number, since it is larger than the sum of its proper divisors (1).

6623531 is an equidigital number, since it uses as much as digits as its factorization.

6623531 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3240, while the sum is 26.

The square root of 6623531 is about 2573.6221556398. The cubic root of 6623531 is about 187.8004049647.

Adding to 6623531 its reverse (1353266), we get a palindrome (7976797).

It can be divided in two parts, 66235 and 31, that added together give a palindrome (66266).

The spelling of 6623531 in words is "six million, six hundred twenty-three thousand, five hundred thirty-one".