642552523 has 2 divisors, whose sum is σ = 642552524. Its totient is φ = 642552522.

The previous prime is 642552509. The next prime is 642552577. The reversal of 642552523 is 325255246.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 642552523 - 2⁹ = 642552011 is a prime.

It is not a weakly prime, because it can be changed into another prime (642552503) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 321276261 + 321276262.

It is an arithmetic number, because the mean of its divisors is an integer number (321276262).

Almost surely, 2^642552523 is an apocalyptic number.

642552523 is a deficient number, since it is larger than the sum of its proper divisors (1).

642552523 is an equidigital number, since it uses as much as digits as its factorization.

642552523 is an evil number, because the sum of its binary digits is even.

The product of its digits is 72000, while the sum is 34.

The square root of 642552523 is about 25348.6197454615. The cubic root of 642552523 is about 862.9180321262.

The spelling of 642552523 in words is "six hundred forty-two million, five hundred fifty-two thousand, five hundred twenty-three".