645527 has 2 divisors, whose sum is σ = 645528. Its totient is φ = 645526.

The previous prime is 645521. The next prime is 645529. The reversal of 645527 is 725546.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 645527 - 2¹⁴ = 629143 is a prime.

Together with 645529, it forms a pair of twin primes.

It is a Chen prime.

It is an Ulam number.

It is a self number, because there is not a number n which added to its sum of digits gives 645527.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (645521) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 322763 + 322764.

It is an arithmetic number, because the mean of its divisors is an integer number (322764).

2⁶⁴⁵⁵²⁷ is an apocalyptic number.

645527 is a deficient number, since it is larger than the sum of its proper divisors (1).

645527 is an equidigital number, since it uses as much as digits as its factorization.

645527 is an evil number, because the sum of its binary digits is even.

The product of its digits is 8400, while the sum is 29.

The square root of 645527 is about 803.4469490887. The cubic root of 645527 is about 86.4247510679.

The spelling of 645527 in words is "six hundred forty-five thousand, five hundred twenty-seven".