71671057 has 2 divisors, whose sum is σ = 71671058. Its totient is φ = 71671056.

The previous prime is 71671051. The next prime is 71671073. The reversal of 71671057 is 75017617.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 70963776 + 707281 = 8424^2 + 841^2 .

It is a cyclic number.

It is not a de Polignac number, because 71671057 - 2³ = 71671049 is a prime.

It is a super-2 number, since 2×71671057² = 10273480822994498, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (71671051) 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, 35835528 + 35835529.

It is an arithmetic number, because the mean of its divisors is an integer number (35835529).

Almost surely, 2^71671057 is an apocalyptic number.

It is an amenable number.

71671057 is a deficient number, since it is larger than the sum of its proper divisors (1).

71671057 is an equidigital number, since it uses as much as digits as its factorization.

71671057 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 10290, while the sum is 34.

The square root of 71671057 is about 8465.8760326383. The cubic root of 71671057 is about 415.3822519554.

The spelling of 71671057 in words is "seventy-one million, six hundred seventy-one thousand, fifty-seven".