642199741 has 2 divisors, whose sum is σ = 642199742. Its totient is φ = 642199740.

The previous prime is 642199739. The next prime is 642199763. The reversal of 642199741 is 147991246.

642199741 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 636098841 + 6100900 = 25221^2 + 2470^2 .

It is a cyclic number.

It is not a de Polignac number, because 642199741 - 2¹ = 642199739 is a prime.

Together with 642199739, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (642199771) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 321099870 + 321099871.

It is an arithmetic number, because the mean of its divisors is an integer number (321099871).

Almost surely, 2^642199741 is an apocalyptic number.

It is an amenable number.

642199741 is a deficient number, since it is larger than the sum of its proper divisors (1).

642199741 is an equidigital number, since it uses as much as digits as its factorization.

642199741 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 108864, while the sum is 43.

The square root of 642199741 is about 25341.6601863414. The cubic root of 642199741 is about 862.7600799652.

The spelling of 642199741 in words is "six hundred forty-two million, one hundred ninety-nine thousand, seven hundred forty-one".