71677849 has 2 divisors, whose sum is σ = 71677850. Its totient is φ = 71677848.

The previous prime is 71677817. The next prime is 71677877. The reversal of 71677849 is 94877617.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 53187849 + 18490000 = 7293^2 + 4300^2 .

It is an emirp because it is prime and its reverse (94877617) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 71677849 - 2⁵ = 71677817 is a prime.

It is not a weakly prime, because it can be changed into another prime (71677349) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35838924 + 35838925.

It is an arithmetic number, because the mean of its divisors is an integer number (35838925).

Almost surely, 2^71677849 is an apocalyptic number.

It is an amenable number.

71677849 is a deficient number, since it is larger than the sum of its proper divisors (1).

71677849 is an equidigital number, since it uses as much as digits as its factorization.

71677849 is an evil number, because the sum of its binary digits is even.

The product of its digits is 592704, while the sum is 49.

The square root of 71677849 is about 8466.2771629566. The cubic root of 71677849 is about 415.3953729522.

The spelling of 71677849 in words is "seventy-one million, six hundred seventy-seven thousand, eight hundred forty-nine".