71650489 has 2 divisors, whose sum is σ = 71650490. Its totient is φ = 71650488.

The previous prime is 71650487. The next prime is 71650499. The reversal of 71650489 is 98405617.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 71149225 + 501264 = 8435^2 + 708^2 .

It is a cyclic number.

It is not a de Polignac number, because 71650489 - 2¹ = 71650487 is a prime.

Together with 71650487, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (71650483) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35825244 + 35825245.

It is an arithmetic number, because the mean of its divisors is an integer number (35825245).

Almost surely, 2^71650489 is an apocalyptic number.

It is an amenable number.

71650489 is a deficient number, since it is larger than the sum of its proper divisors (1).

71650489 is an equidigital number, since it uses as much as digits as its factorization.

71650489 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 60480, while the sum is 40.

The square root of 71650489 is about 8464.6611863677. The cubic root of 71650489 is about 415.3425129965.

The spelling of 71650489 in words is "seventy-one million, six hundred fifty thousand, four hundred eighty-nine".