71250001 has 4 divisors (see below), whose sum is σ = 71770212. Its totient is φ = 70729792.

The previous prime is 71249999. The next prime is 71250007. The reversal of 71250001 is 10005217.

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 46240000 + 25010001 = 6800^2 + 5001^2 .

It is a cyclic number.

It is not a de Polignac number, because 71250001 - 2¹ = 71249999 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (71250007) 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, 259900 + ... + 260173.

It is an arithmetic number, because the mean of its divisors is an integer number (17942553).

Almost surely, 2^71250001 is an apocalyptic number.

It is an amenable number.

71250001 is a deficient number, since it is larger than the sum of its proper divisors (520211).

71250001 is a wasteful number, since it uses less digits than its factorization.

71250001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 520210.

The product of its (nonzero) digits is 70, while the sum is 16.

The square root of 71250001 is about 8440.9715673020. The cubic root of 71250001 is about 414.5672190320.

Adding to 71250001 its reverse (10005217), we get a palindrome (81255218).

The spelling of 71250001 in words is "seventy-one million, two hundred fifty thousand, one".