61866971 has 2 divisors, whose sum is σ = 61866972. Its totient is φ = 61866970.

The previous prime is 61866967. The next prime is 61867007. The reversal of 61866971 is 17966816.

61866971 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 is a cyclic number.

It is not a de Polignac number, because 61866971 - 2² = 61866967 is a prime.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (61866271) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30933485 + 30933486.

It is an arithmetic number, because the mean of its divisors is an integer number (30933486).

Almost surely, 2^61866971 is an apocalyptic number.

61866971 is a deficient number, since it is larger than the sum of its proper divisors (1).

61866971 is an equidigital number, since it uses as much as digits as its factorization.

61866971 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 108864, while the sum is 44.

The square root of 61866971 is about 7865.5559879769. Note that the first 3 decimals coincide. The cubic root of 61866971 is about 395.5058860322.

The spelling of 61866971 in words is "sixty-one million, eight hundred sixty-six thousand, nine hundred seventy-one".