71971451 has 2 divisors, whose sum is σ = 71971452. Its totient is φ = 71971450.

The previous prime is 71971423. The next prime is 71971457. The reversal of 71971451 is 15417917.

It is a strong prime.

It is an emirp because it is prime and its reverse (15417917) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 71971451 - 2¹⁸ = 71709307 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (71971457) 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, 35985725 + 35985726.

It is an arithmetic number, because the mean of its divisors is an integer number (35985726).

Almost surely, 2^71971451 is an apocalyptic number.

71971451 is a deficient number, since it is larger than the sum of its proper divisors (1).

71971451 is an equidigital number, since it uses as much as digits as its factorization.

71971451 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 8820, while the sum is 35.

The square root of 71971451 is about 8483.5989414870. The cubic root of 71971451 is about 415.9617718662.

The spelling of 71971451 in words is "seventy-one million, nine hundred seventy-one thousand, four hundred fifty-one".