6540623 has 2 divisors, whose sum is σ = 6540624. Its totient is φ = 6540622.

The previous prime is 6540619. The next prime is 6540637. The reversal of 6540623 is 3260456.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 6540623 - 2² = 6540619 is a prime.

It is a Sophie Germain prime.

It is equal to p₄₄₇₃₅₃ and since 6540623 and 447353 have the same sum of digits, it is a Honaker prime.

It is a junction number, because it is equal to n+sod(n) for n = 6540592 and 6540601.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6540643) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3270311 + 3270312.

It is an arithmetic number, because the mean of its divisors is an integer number (3270312).

Almost surely, 2^6540623 is an apocalyptic number.

6540623 is a deficient number, since it is larger than the sum of its proper divisors (1).

6540623 is an equidigital number, since it uses as much as digits as its factorization.

6540623 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4320, while the sum is 26.

The square root of 6540623 is about 2557.4641737471. The cubic root of 6540623 is about 187.0135348187.

The spelling of 6540623 in words is "six million, five hundred forty thousand, six hundred twenty-three".