642527 has 2 divisors, whose sum is σ = 642528. Its totient is φ = 642526.

The previous prime is 642517. The next prime is 642529. The reversal of 642527 is 725246.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 642527 - 2¹² = 638431 is a prime.

Together with 642529, it forms a pair of twin primes.

It is a Chen prime.

It is a plaindrome in base 16.

It is a junction number, because it is equal to n+sod(n) for n = 642496 and 642505.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 642527.

It is not a weakly prime, because it can be changed into another prime (642529) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 321263 + 321264.

It is an arithmetic number, because the mean of its divisors is an integer number (321264).

2⁶⁴²⁵²⁷ is an apocalyptic number.

642527 is a deficient number, since it is larger than the sum of its proper divisors (1).

642527 is an equidigital number, since it uses as much as digits as its factorization.

642527 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3360, while the sum is 26.

The square root of 642527 is about 801.5778190544. The cubic root of 642527 is about 86.2906606576.

The spelling of 642527 in words is "six hundred forty-two thousand, five hundred twenty-seven".