71765989 has 2 divisors, whose sum is σ = 71765990. Its totient is φ = 71765988.

The previous prime is 71765987. The next prime is 71766043. The reversal of 71765989 is 98956717.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 39753025 + 32012964 = 6305^2 + 5658^2 .

It is a cyclic number.

It is not a de Polignac number, because 71765989 - 2¹ = 71765987 is a prime.

Together with 71765987, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (71765987) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35882994 + 35882995.

It is an arithmetic number, because the mean of its divisors is an integer number (35882995).

Almost surely, 2^71765989 is an apocalyptic number.

It is an amenable number.

71765989 is a deficient number, since it is larger than the sum of its proper divisors (1).

71765989 is an equidigital number, since it uses as much as digits as its factorization.

71765989 is an evil number, because the sum of its binary digits is even.

The product of its digits is 952560, while the sum is 52.

The square root of 71765989 is about 8471.4809213030. The cubic root of 71765989 is about 415.5655694246.

The spelling of 71765989 in words is "seventy-one million, seven hundred sixty-five thousand, nine hundred eighty-nine".