71106509 has 2 divisors, whose sum is σ = 71106510. Its totient is φ = 71106508.

The previous prime is 71106499. The next prime is 71106527. The reversal of 71106509 is 90560117.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 68475625 + 2630884 = 8275^2 + 1622^2 .

It is a cyclic number.

It is not a de Polignac number, because 71106509 - 2¹² = 71102413 is a prime.

It is a super-2 number, since 2×71106509² = 10112271244334162, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (71106209) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35553254 + 35553255.

It is an arithmetic number, because the mean of its divisors is an integer number (35553255).

Almost surely, 2^71106509 is an apocalyptic number.

It is an amenable number.

71106509 is a deficient number, since it is larger than the sum of its proper divisors (1).

71106509 is an equidigital number, since it uses as much as digits as its factorization.

71106509 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1890, while the sum is 29.

The square root of 71106509 is about 8432.4675510790. The cubic root of 71106509 is about 414.2887298744.

The spelling of 71106509 in words is "seventy-one million, one hundred six thousand, five hundred nine".