71471909 has 2 divisors, whose sum is σ = 71471910. Its totient is φ = 71471908.

The previous prime is 71471903. The next prime is 71471923. The reversal of 71471909 is 90917417.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 51696100 + 19775809 = 7190^2 + 4447^2 .

It is a cyclic number.

It is not a de Polignac number, because 71471909 - 2¹⁶ = 71406373 is a prime.

It is a super-2 number, since 2×71471909² = 10216467552208562, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (71471903) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35735954 + 35735955.

It is an arithmetic number, because the mean of its divisors is an integer number (35735955).

Almost surely, 2^71471909 is an apocalyptic number.

It is an amenable number.

71471909 is a deficient number, since it is larger than the sum of its proper divisors (1).

71471909 is an equidigital number, since it uses as much as digits as its factorization.

71471909 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 15876, while the sum is 38.

The square root of 71471909 is about 8454.1060438109. The cubic root of 71471909 is about 414.9971626070.

The spelling of 71471909 in words is "seventy-one million, four hundred seventy-one thousand, nine hundred nine".