71389867 has 2 divisors, whose sum is σ = 71389868. Its totient is φ = 71389866.

The previous prime is 71389853. The next prime is 71389873. The reversal of 71389867 is 76898317.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-71389867 is a prime.

It is a super-2 number, since 2×71389867² = 10193026220555378, 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 71389867.

It is not a weakly prime, because it can be changed into another prime (71380867) 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, 35694933 + 35694934.

It is an arithmetic number, because the mean of its divisors is an integer number (35694934).

Almost surely, 2^71389867 is an apocalyptic number.

71389867 is a deficient number, since it is larger than the sum of its proper divisors (1).

71389867 is an equidigital number, since it uses as much as digits as its factorization.

71389867 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 508032, while the sum is 49.

The square root of 71389867 is about 8449.2524521404. The cubic root of 71389867 is about 414.8383112322.

It can be divided in two parts, 7138 and 9867, that multiplied together give a triangular number (70430646 = T₁₁₈₆₈).

The spelling of 71389867 in words is "seventy-one million, three hundred eighty-nine thousand, eight hundred sixty-seven".