71835521 has 2 divisors, whose sum is σ = 71835522. Its totient is φ = 71835520.

The previous prime is 71835493. The next prime is 71835527. The reversal of 71835521 is 12553817.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 63361600 + 8473921 = 7960^2 + 2911^2 .

It is an emirp because it is prime and its reverse (12553817) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-71835521 is a prime.

It is equal to p_4219565 and since 71835521 and 4219565 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (71835527) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35917760 + 35917761.

It is an arithmetic number, because the mean of its divisors is an integer number (35917761).

Almost surely, 2^71835521 is an apocalyptic number.

It is an amenable number.

71835521 is a deficient number, since it is larger than the sum of its proper divisors (1).

71835521 is an equidigital number, since it uses as much as digits as its factorization.

71835521 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 71835521 is about 8475.5838146997. The cubic root of 71835521 is about 415.6997359415.

The spelling of 71835521 in words is "seventy-one million, eight hundred thirty-five thousand, five hundred twenty-one".