71972413 has 2 divisors, whose sum is σ = 71972414. Its totient is φ = 71972412.

The previous prime is 71972401. The next prime is 71972419. The reversal of 71972413 is 31427917.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 50098084 + 21874329 = 7078^2 + 4677^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-71972413 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (71972419) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35986206 + 35986207.

It is an arithmetic number, because the mean of its divisors is an integer number (35986207).

Almost surely, 2^71972413 is an apocalyptic number.

It is an amenable number.

71972413 is a deficient number, since it is larger than the sum of its proper divisors (1).

71972413 is an equidigital number, since it uses as much as digits as its factorization.

71972413 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 10584, while the sum is 34.

The square root of 71972413 is about 8483.6556389330. The cubic root of 71972413 is about 415.9636251633.

The spelling of 71972413 in words is "seventy-one million, nine hundred seventy-two thousand, four hundred thirteen".