71520973 has 2 divisors, whose sum is σ = 71520974. Its totient is φ = 71520972.

The previous prime is 71520971. The next prime is 71521001. The reversal of 71520973 is 37902517.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 70593604 + 927369 = 8402^2 + 963^2 .

It is an emirp because it is prime and its reverse (37902517) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 71520973 - 2¹ = 71520971 is a prime.

Together with 71520971, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (71520971) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35760486 + 35760487.

It is an arithmetic number, because the mean of its divisors is an integer number (35760487).

Almost surely, 2^71520973 is an apocalyptic number.

It is an amenable number.

71520973 is a deficient number, since it is larger than the sum of its proper divisors (1).

71520973 is an equidigital number, since it uses as much as digits as its factorization.

71520973 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 13230, while the sum is 34.

The square root of 71520973 is about 8457.0073312017. The cubic root of 71520973 is about 415.0921032329.

The spelling of 71520973 in words is "seventy-one million, five hundred twenty thousand, nine hundred seventy-three".