71523643 has 2 divisors, whose sum is σ = 71523644. Its totient is φ = 71523642.

The previous prime is 71523637. The next prime is 71523653. The reversal of 71523643 is 34632517.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 71523643 - 2⁵ = 71523611 is a prime.

It is not a weakly prime, because it can be changed into another prime (71523623) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35761821 + 35761822.

It is an arithmetic number, because the mean of its divisors is an integer number (35761822).

Almost surely, 2^71523643 is an apocalyptic number.

71523643 is a deficient number, since it is larger than the sum of its proper divisors (1).

71523643 is an equidigital number, since it uses as much as digits as its factorization.

71523643 is an evil number, because the sum of its binary digits is even.

The product of its digits is 15120, while the sum is 31.

The square root of 71523643 is about 8457.1651869879. The cubic root of 71523643 is about 415.0972685342.

The spelling of 71523643 in words is "seventy-one million, five hundred twenty-three thousand, six hundred forty-three".