71250821 has 2 divisors, whose sum is σ = 71250822. Its totient is φ = 71250820.

The previous prime is 71250799. The next prime is 71250841. The reversal of 71250821 is 12805217.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 37957921 + 33292900 = 6161^2 + 5770^2 .

It is an emirp because it is prime and its reverse (12805217) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 71250821 - 2²⁶ = 4141957 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (71250841) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35625410 + 35625411.

It is an arithmetic number, because the mean of its divisors is an integer number (35625411).

Almost surely, 2^71250821 is an apocalyptic number.

It is an amenable number.

71250821 is a deficient number, since it is larger than the sum of its proper divisors (1).

71250821 is an equidigital number, since it uses as much as digits as its factorization.

71250821 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1120, while the sum is 26.

The square root of 71250821 is about 8441.0201397698. The cubic root of 71250821 is about 414.5688094124.

The spelling of 71250821 in words is "seventy-one million, two hundred fifty thousand, eight hundred twenty-one".