71081057 has 2 divisors, whose sum is σ = 71081058. Its totient is φ = 71081056.

The previous prime is 71080991. The next prime is 71081083. The reversal of 71081057 is 75018017.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 68492176 + 2588881 = 8276^2 + 1609^2 .

It is an emirp because it is prime and its reverse (75018017) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 71081057 - 2¹⁰ = 71080033 is a prime.

It is not a weakly prime, because it can be changed into another prime (71081557) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35540528 + 35540529.

It is an arithmetic number, because the mean of its divisors is an integer number (35540529).

Almost surely, 2^71081057 is an apocalyptic number.

It is an amenable number.

71081057 is a deficient number, since it is larger than the sum of its proper divisors (1).

71081057 is an equidigital number, since it uses as much as digits as its factorization.

71081057 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1960, while the sum is 29.

The square root of 71081057 is about 8430.9582492146. The cubic root of 71081057 is about 414.2392935417.

The spelling of 71081057 in words is "seventy-one million, eighty-one thousand, fifty-seven".