71530387 has 2 divisors, whose sum is σ = 71530388. Its totient is φ = 71530386.

The previous prime is 71530367. The next prime is 71530397. The reversal of 71530387 is 78303517.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-71530387 is a prime.

It is not a weakly prime, because it can be changed into another prime (71530367) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35765193 + 35765194.

It is an arithmetic number, because the mean of its divisors is an integer number (35765194).

Almost surely, 2^71530387 is an apocalyptic number.

71530387 is a deficient number, since it is larger than the sum of its proper divisors (1).

71530387 is an equidigital number, since it uses as much as digits as its factorization.

71530387 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 17640, while the sum is 34.

The square root of 71530387 is about 8457.5638927530. The cubic root of 71530387 is about 415.1103147004.

It can be divided in two parts, 71530 and 387, that added together give a palindrome (71917).

The spelling of 71530387 in words is "seventy-one million, five hundred thirty thousand, three hundred eighty-seven".