642525253 has 2 divisors, whose sum is σ = 642525254. Its totient is φ = 642525252.

The previous prime is 642525241. The next prime is 642525269. The reversal of 642525253 is 352525246.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 441084004 + 201441249 = 21002^2 + 14193^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-642525253 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (642525053) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 321262626 + 321262627.

It is an arithmetic number, because the mean of its divisors is an integer number (321262627).

Almost surely, 2^642525253 is an apocalyptic number.

It is an amenable number.

642525253 is a deficient number, since it is larger than the sum of its proper divisors (1).

642525253 is an equidigital number, since it uses as much as digits as its factorization.

642525253 is an odious number, because the sum of its binary digits is odd.

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

The square root of 642525253 is about 25348.0818406443. The cubic root of 642525253 is about 862.9058245080.

The spelling of 642525253 in words is "six hundred forty-two million, five hundred twenty-five thousand, two hundred fifty-three".