71985161 has 2 divisors, whose sum is σ = 71985162. Its totient is φ = 71985160.

The previous prime is 71985149. The next prime is 71985169. The reversal of 71985161 is 16158917.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 51337225 + 20647936 = 7165^2 + 4544^2 .

It is a cyclic number.

It is not a de Polignac number, because 71985161 - 2⁶ = 71985097 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (71985169) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35992580 + 35992581.

It is an arithmetic number, because the mean of its divisors is an integer number (35992581).

Almost surely, 2^71985161 is an apocalyptic number.

It is an amenable number.

71985161 is a deficient number, since it is larger than the sum of its proper divisors (1).

71985161 is an equidigital number, since it uses as much as digits as its factorization.

71985161 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 15120, while the sum is 38.

The square root of 71985161 is about 8484.4069327208. The cubic root of 71985161 is about 415.9881826802.

The spelling of 71985161 in words is "seventy-one million, nine hundred eighty-five thousand, one hundred sixty-one".