71315501 has 2 divisors, whose sum is σ = 71315502. Its totient is φ = 71315500.

The previous prime is 71315477. The next prime is 71315507. The reversal of 71315501 is 10551317.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 59274601 + 12040900 = 7699^2 + 3470^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-71315501 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (71315507) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35657750 + 35657751.

It is an arithmetic number, because the mean of its divisors is an integer number (35657751).

Almost surely, 2^71315501 is an apocalyptic number.

It is an amenable number.

71315501 is a deficient number, since it is larger than the sum of its proper divisors (1).

71315501 is an equidigital number, since it uses as much as digits as its factorization.

71315501 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 525, while the sum is 23.

The square root of 71315501 is about 8444.8505611408. The cubic root of 71315501 is about 414.6942170942.

Adding to 71315501 its reverse (10551317), we get a palindrome (81866818).

The spelling of 71315501 in words is "seventy-one million, three hundred fifteen thousand, five hundred one".