71862521 has 2 divisors, whose sum is σ = 71862522. Its totient is φ = 71862520.

The previous prime is 71862509. The next prime is 71862523. The reversal of 71862521 is 12526817.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 55950400 + 15912121 = 7480^2 + 3989^2 .

It is an emirp because it is prime and its reverse (12526817) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 71862521 - 2⁶ = 71862457 is a prime.

Together with 71862523, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (71862523) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35931260 + 35931261.

It is an arithmetic number, because the mean of its divisors is an integer number (35931261).

Almost surely, 2^71862521 is an apocalyptic number.

It is an amenable number.

71862521 is a deficient number, since it is larger than the sum of its proper divisors (1).

71862521 is an equidigital number, since it uses as much as digits as its factorization.

71862521 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6720, while the sum is 32.

The square root of 71862521 is about 8477.1764756905. The cubic root of 71862521 is about 415.7518108612.

The spelling of 71862521 in words is "seventy-one million, eight hundred sixty-two thousand, five hundred twenty-one".