61042643 has 2 divisors, whose sum is σ = 61042644. Its totient is φ = 61042642.

The previous prime is 61042633. The next prime is 61042691. The reversal of 61042643 is 34624016.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-61042643 is a prime.

It is not a weakly prime, because it can be changed into another prime (61042603) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30521321 + 30521322.

It is an arithmetic number, because the mean of its divisors is an integer number (30521322).

Almost surely, 2^61042643 is an apocalyptic number.

61042643 is a deficient number, since it is larger than the sum of its proper divisors (1).

61042643 is an equidigital number, since it uses as much as digits as its factorization.

61042643 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3456, while the sum is 26.

The square root of 61042643 is about 7812.9791373074. The cubic root of 61042643 is about 393.7414259324.

Adding to 61042643 its reverse (34624016), we get a palindrome (95666659).

The spelling of 61042643 in words is "sixty-one million, forty-two thousand, six hundred forty-three".