71031901 has 2 divisors, whose sum is σ = 71031902. Its totient is φ = 71031900.

The previous prime is 71031893. The next prime is 71031953. The reversal of 71031901 is 10913017.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 49632025 + 21399876 = 7045^2 + 4626^2 .

It is a cyclic number.

It is not a de Polignac number, because 71031901 - 2³ = 71031893 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 (71038901) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35515950 + 35515951.

It is an arithmetic number, because the mean of its divisors is an integer number (35515951).

Almost surely, 2^71031901 is an apocalyptic number.

It is an amenable number.

71031901 is a deficient number, since it is larger than the sum of its proper divisors (1).

71031901 is an equidigital number, since it uses as much as digits as its factorization.

71031901 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 189, while the sum is 22.

The square root of 71031901 is about 8428.0425366748. The cubic root of 71031901 is about 414.1437826643.

Adding to 71031901 its reverse (10913017), we get a palindrome (81944918).

The spelling of 71031901 in words is "seventy-one million, thirty-one thousand, nine hundred one".