71625511 has 4 divisors (see below), whose sum is σ = 71691552. Its totient is φ = 71559472.

The previous prime is 71625503. The next prime is 71625551. The reversal of 71625511 is 11552617.

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

It is a cyclic number.

It is not a de Polignac number, because 71625511 - 2³ = 71625503 is a prime.

It is a super-2 number, since 2×71625511² = 10260427652022242, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 71625511.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71625551) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 31366 + ... + 33571.

It is an arithmetic number, because the mean of its divisors is an integer number (17922888).

Almost surely, 2^71625511 is an apocalyptic number.

71625511 is a deficient number, since it is larger than the sum of its proper divisors (66041).

71625511 is a wasteful number, since it uses less digits than its factorization.

71625511 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 66040.

The product of its digits is 2100, while the sum is 28.

The square root of 71625511 is about 8463.1856295369. The cubic root of 71625511 is about 415.2942433512.

The spelling of 71625511 in words is "seventy-one million, six hundred twenty-five thousand, five hundred eleven".