71670331 has 2 divisors, whose sum is σ = 71670332. Its totient is φ = 71670330.

The previous prime is 71670259. The next prime is 71670349. The reversal of 71670331 is 13307617.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 71670331 - 2¹¹ = 71668283 is a prime.

It is a super-2 number, since 2×71670331² = 10273272691299122, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 71670331.

It is not a weakly prime, because it can be changed into another prime (71670371) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35835165 + 35835166.

It is an arithmetic number, because the mean of its divisors is an integer number (35835166).

Almost surely, 2^71670331 is an apocalyptic number.

71670331 is a deficient number, since it is larger than the sum of its proper divisors (1).

71670331 is an equidigital number, since it uses as much as digits as its factorization.

71670331 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2646, while the sum is 28.

The square root of 71670331 is about 8465.8331545100. The cubic root of 71670331 is about 415.3808493969.

Adding to 71670331 its reverse (13307617), we get a palindrome (84977948).

The spelling of 71670331 in words is "seventy-one million, six hundred seventy thousand, three hundred thirty-one".