71871049 has 2 divisors, whose sum is σ = 71871050. Its totient is φ = 71871048.

The previous prime is 71871047. The next prime is 71871071. The reversal of 71871049 is 94017817.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 71707024 + 164025 = 8468^2 + 405^2 .

It is a cyclic number.

It is not a de Polignac number, because 71871049 - 2¹ = 71871047 is a prime.

Together with 71871047, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 71870999 and 71871017.

It is not a weakly prime, because it can be changed into another prime (71871047) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35935524 + 35935525.

It is an arithmetic number, because the mean of its divisors is an integer number (35935525).

Almost surely, 2^71871049 is an apocalyptic number.

It is an amenable number.

71871049 is a deficient number, since it is larger than the sum of its proper divisors (1).

71871049 is an equidigital number, since it uses as much as digits as its factorization.

71871049 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 14112, while the sum is 37.

The square root of 71871049 is about 8477.6794584367. The cubic root of 71871049 is about 415.7682561104.

The spelling of 71871049 in words is "seventy-one million, eight hundred seventy-one thousand, forty-nine".