71389849 has 2 divisors, whose sum is σ = 71389850. Its totient is φ = 71389848.

The previous prime is 71389841. The next prime is 71389853. The reversal of 71389849 is 94898317.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 71318025 + 71824 = 8445^2 + 268^2 .

It is an emirp because it is prime and its reverse (94898317) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 71389849 - 2³ = 71389841 is a prime.

It is not a weakly prime, because it can be changed into another prime (71389841) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35694924 + 35694925.

It is an arithmetic number, because the mean of its divisors is an integer number (35694925).

Almost surely, 2^71389849 is an apocalyptic number.

It is an amenable number.

71389849 is a deficient number, since it is larger than the sum of its proper divisors (1).

71389849 is an equidigital number, since it uses as much as digits as its factorization.

71389849 is an evil number, because the sum of its binary digits is even.

The product of its digits is 435456, while the sum is 49.

The square root of 71389849 is about 8449.2513869573. The cubic root of 71389849 is about 414.8382763668.

The spelling of 71389849 in words is "seventy-one million, three hundred eighty-nine thousand, eight hundred forty-nine".