71565001 has 6 divisors (see below), whose sum is σ = 75530202. Its totient is φ = 67798080.

The previous prime is 71564971. The next prime is 71565023. The reversal of 71565001 is 10056517.

It can be written as a sum of positive squares in only one way, i.e., 39075001 + 32490000 = 6251^2 + 5700^2 .

It is not a de Polignac number, because 71565001 - 2¹³ = 71556809 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (71565041) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 98760 + ... + 99481.

It is an arithmetic number, because the mean of its divisors is an integer number (12588367).

Almost surely, 2^71565001 is an apocalyptic number.

It is an amenable number.

71565001 is a deficient number, since it is larger than the sum of its proper divisors (3965201).

71565001 is a wasteful number, since it uses less digits than its factorization.

71565001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 198279 (or 198260 counting only the distinct ones).

The product of its (nonzero) digits is 1050, while the sum is 25.

The square root of 71565001 is about 8459.6099791893. The cubic root of 71565001 is about 415.1772620588.

The spelling of 71565001 in words is "seventy-one million, five hundred sixty-five thousand, one".