71061817 has 4 divisors (see below), whose sum is σ = 72402660. Its totient is φ = 69720976.

The previous prime is 71061799. The next prime is 71061821. The reversal of 71061817 is 71816017.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 39488656 + 31573161 = 6284^2 + 5619^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-71061817 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (71061217) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 670342 + ... + 670447.

It is an arithmetic number, because the mean of its divisors is an integer number (18100665).

Almost surely, 2^71061817 is an apocalyptic number.

It is an amenable number.

71061817 is a deficient number, since it is larger than the sum of its proper divisors (1340843).

71061817 is a wasteful number, since it uses less digits than its factorization.

71061817 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1340842.

The product of its (nonzero) digits is 2352, while the sum is 31.

The square root of 71061817 is about 8429.8171391792. The cubic root of 71061817 is about 414.2019151667.

The spelling of 71061817 in words is "seventy-one million, sixty-one thousand, eight hundred seventeen".