71215901 has 2 divisors, whose sum is σ = 71215902. Its totient is φ = 71215900.

The previous prime is 71215849. The next prime is 71215919. The reversal of 71215901 is 10951217.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 70123876 + 1092025 = 8374^2 + 1045^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-71215901 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 (71214901) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35607950 + 35607951.

It is an arithmetic number, because the mean of its divisors is an integer number (35607951).

Almost surely, 2^71215901 is an apocalyptic number.

It is an amenable number.

71215901 is a deficient number, since it is larger than the sum of its proper divisors (1).

71215901 is an equidigital number, since it uses as much as digits as its factorization.

71215901 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 630, while the sum is 26.

The square root of 71215901 is about 8438.9514159047. The cubic root of 71215901 is about 414.5010716737.

The spelling of 71215901 in words is "seventy-one million, two hundred fifteen thousand, nine hundred one".