61679543 has 2 divisors, whose sum is σ = 61679544. Its totient is φ = 61679542.

The previous prime is 61679531. The next prime is 61679561. The reversal of 61679543 is 34597616.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 61679543 - 2¹² = 61675447 is a prime.

It is a Sophie Germain prime.

It is a self number, because there is not a number n which added to its sum of digits gives 61679543.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (61679573) 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, 30839771 + 30839772.

It is an arithmetic number, because the mean of its divisors is an integer number (30839772).

Almost surely, 2^61679543 is an apocalyptic number.

61679543 is a deficient number, since it is larger than the sum of its proper divisors (1).

61679543 is an equidigital number, since it uses as much as digits as its factorization.

61679543 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 136080, while the sum is 41.

The square root of 61679543 is about 7853.6324716656. The cubic root of 61679543 is about 395.1060827076.

The spelling of 61679543 in words is "sixty-one million, six hundred seventy-nine thousand, five hundred forty-three".