71205157 has 2 divisors, whose sum is σ = 71205158. Its totient is φ = 71205156.

The previous prime is 71205143. The next prime is 71205161. The reversal of 71205157 is 75150217.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 69205761 + 1999396 = 8319^2 + 1414^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-71205157 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (71205187) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35602578 + 35602579.

It is an arithmetic number, because the mean of its divisors is an integer number (35602579).

Almost surely, 2^71205157 is an apocalyptic number.

It is an amenable number.

71205157 is a deficient number, since it is larger than the sum of its proper divisors (1).

71205157 is an equidigital number, since it uses as much as digits as its factorization.

71205157 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2450, while the sum is 28.

The square root of 71205157 is about 8438.3148199152. The cubic root of 71205157 is about 414.4802260319.

The spelling of 71205157 in words is "seventy-one million, two hundred five thousand, one hundred fifty-seven".