642900113 has 2 divisors, whose sum is σ = 642900114. Its totient is φ = 642900112.

The previous prime is 642900109. The next prime is 642900119. The reversal of 642900113 is 311009246.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 639685264 + 3214849 = 25292^2 + 1793^2 .

It is a cyclic number.

It is not a de Polignac number, because 642900113 - 2² = 642900109 is a prime.

It is not a weakly prime, because it can be changed into another prime (642900119) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 321450056 + 321450057.

It is an arithmetic number, because the mean of its divisors is an integer number (321450057).

Almost surely, 2^642900113 is an apocalyptic number.

It is an amenable number.

642900113 is a deficient number, since it is larger than the sum of its proper divisors (1).

642900113 is an equidigital number, since it uses as much as digits as its factorization.

642900113 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1296, while the sum is 26.

The square root of 642900113 is about 25355.4750103405. The cubic root of 642900113 is about 863.0736031234.

Adding to 642900113 its reverse (311009246), we get a palindrome (953909359).

The spelling of 642900113 in words is "six hundred forty-two million, nine hundred thousand, one hundred thirteen".