642504697 has 2 divisors, whose sum is σ = 642504698. Its totient is φ = 642504696.

The previous prime is 642504689. The next prime is 642504713. The reversal of 642504697 is 796405246.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 414977641 + 227527056 = 20371^2 + 15084^2 .

It is a cyclic number.

It is not a de Polignac number, because 642504697 - 2³ = 642504689 is a prime.

It is not a weakly prime, because it can be changed into another prime (642504397) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 321252348 + 321252349.

It is an arithmetic number, because the mean of its divisors is an integer number (321252349).

Almost surely, 2^642504697 is an apocalyptic number.

It is an amenable number.

642504697 is a deficient number, since it is larger than the sum of its proper divisors (1).

642504697 is an equidigital number, since it uses as much as digits as its factorization.

642504697 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 362880, while the sum is 43.

The square root of 642504697 is about 25347.6763629332. The cubic root of 642504697 is about 862.8966222335.

The spelling of 642504697 in words is "six hundred forty-two million, five hundred four thousand, six hundred ninety-seven".