71997503 has 2 divisors, whose sum is σ = 71997504. Its totient is φ = 71997502.

The previous prime is 71997481. The next prime is 71997553. The reversal of 71997503 is 30579917.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 71997503 - 2⁶ = 71997439 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (71997553) 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, 35998751 + 35998752.

It is an arithmetic number, because the mean of its divisors is an integer number (35998752).

Almost surely, 2^71997503 is an apocalyptic number.

71997503 is a deficient number, since it is larger than the sum of its proper divisors (1).

71997503 is an equidigital number, since it uses as much as digits as its factorization.

71997503 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 59535, while the sum is 41.

The square root of 71997503 is about 8485.1342358268. The cubic root of 71997503 is about 416.0119553239.

The spelling of 71997503 in words is "seventy-one million, nine hundred ninety-seven thousand, five hundred three".