71825513 has 2 divisors, whose sum is σ = 71825514. Its totient is φ = 71825512.

The previous prime is 71825477. The next prime is 71825521. The reversal of 71825513 is 31552817.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 71690089 + 135424 = 8467^2 + 368^2 .

It is an emirp because it is prime and its reverse (31552817) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 71825513 - 2⁶ = 71825449 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 71825513.

It is not a weakly prime, because it can be changed into another prime (71825213) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35912756 + 35912757.

It is an arithmetic number, because the mean of its divisors is an integer number (35912757).

Almost surely, 2^71825513 is an apocalyptic number.

It is an amenable number.

71825513 is a deficient number, since it is larger than the sum of its proper divisors (1).

71825513 is an equidigital number, since it uses as much as digits as its factorization.

71825513 is an evil number, because the sum of its binary digits is even.

The product of its digits is 8400, while the sum is 32.

The square root of 71825513 is about 8474.9933923278. The cubic root of 71825513 is about 415.6804301899.

The spelling of 71825513 in words is "seventy-one million, eight hundred twenty-five thousand, five hundred thirteen".