642962549 has 2 divisors, whose sum is σ = 642962550. Its totient is φ = 642962548.

The previous prime is 642962543. The next prime is 642962561. The reversal of 642962549 is 945269246.

642962549 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., 639179524 + 3783025 = 25282^2 + 1945^2 .

It is a cyclic number.

It is not a de Polignac number, because 642962549 - 2⁸ = 642962293 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (642962543) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 321481274 + 321481275.

It is an arithmetic number, because the mean of its divisors is an integer number (321481275).

Almost surely, 2^642962549 is an apocalyptic number.

It is an amenable number.

642962549 is a deficient number, since it is larger than the sum of its proper divisors (1).

642962549 is an equidigital number, since it uses as much as digits as its factorization.

642962549 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 933120, while the sum is 47.

The square root of 642962549 is about 25356.7061938257. The cubic root of 642962549 is about 863.1015416881.

The spelling of 642962549 in words is "six hundred forty-two million, nine hundred sixty-two thousand, five hundred forty-nine".