71995421 has 2 divisors, whose sum is σ = 71995422. Its totient is φ = 71995420.

The previous prime is 71995403. The next prime is 71995463. The reversal of 71995421 is 12459917.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 71995225 + 196 = 8485^2 + 14^2 .

It is an emirp because it is prime and its reverse (12459917) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 71995421 - 2¹⁰ = 71994397 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 (71995621) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35997710 + 35997711.

It is an arithmetic number, because the mean of its divisors is an integer number (35997711).

Almost surely, 2^71995421 is an apocalyptic number.

It is an amenable number.

71995421 is a deficient number, since it is larger than the sum of its proper divisors (1).

71995421 is an equidigital number, since it uses as much as digits as its factorization.

71995421 is an evil number, because the sum of its binary digits is even.

The product of its digits is 22680, while the sum is 38.

The square root of 71995421 is about 8485.0115497859. The cubic root of 71995421 is about 416.0079452532.

The spelling of 71995421 in words is "seventy-one million, nine hundred ninety-five thousand, four hundred twenty-one".