71105513 has 2 divisors, whose sum is σ = 71105514. Its totient is φ = 71105512.

The previous prime is 71105491. The next prime is 71105563. The reversal of 71105513 is 31550117.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 71098624 + 6889 = 8432^2 + 83^2 .

It is a cyclic number.

It is not a de Polignac number, because 71105513 - 2⁶ = 71105449 is a prime.

It is not a weakly prime, because it can be changed into another prime (71105563) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35552756 + 35552757.

It is an arithmetic number, because the mean of its divisors is an integer number (35552757).

Almost surely, 2^71105513 is an apocalyptic number.

It is an amenable number.

71105513 is a deficient number, since it is larger than the sum of its proper divisors (1).

71105513 is an equidigital number, since it uses as much as digits as its factorization.

71105513 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 525, while the sum is 23.

The square root of 71105513 is about 8432.4084934258. The cubic root of 71105513 is about 414.2867955297.

The spelling of 71105513 in words is "seventy-one million, one hundred five thousand, five hundred thirteen".