61959643 has 2 divisors, whose sum is σ = 61959644. Its totient is φ = 61959642.

The previous prime is 61959629. The next prime is 61959649. The reversal of 61959643 is 34695916.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-61959643 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 61959643.

It is not a weakly prime, because it can be changed into another prime (61959649) 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, 30979821 + 30979822.

It is an arithmetic number, because the mean of its divisors is an integer number (30979822).

Almost surely, 2^61959643 is an apocalyptic number.

61959643 is a deficient number, since it is larger than the sum of its proper divisors (1).

61959643 is an equidigital number, since it uses as much as digits as its factorization.

61959643 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 174960, while the sum is 43.

The square root of 61959643 is about 7871.4447847901. Note that the first 3 decimals coincide. The cubic root of 61959643 is about 395.7032667202.

The spelling of 61959643 in words is "sixty-one million, nine hundred fifty-nine thousand, six hundred forty-three".