71518873 has 2 divisors, whose sum is σ = 71518874. Its totient is φ = 71518872.

The previous prime is 71518861. The next prime is 71518921. The reversal of 71518873 is 37881517.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 58247424 + 13271449 = 7632^2 + 3643^2 .

It is an emirp because it is prime and its reverse (37881517) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-71518873 is a prime.

It is a super-2 number, since 2×71518873² = 10229898390380258, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (71518673) 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, 35759436 + 35759437.

It is an arithmetic number, because the mean of its divisors is an integer number (35759437).

Almost surely, 2^71518873 is an apocalyptic number.

It is an amenable number.

71518873 is a deficient number, since it is larger than the sum of its proper divisors (1).

71518873 is an equidigital number, since it uses as much as digits as its factorization.

71518873 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 47040, while the sum is 40.

The square root of 71518873 is about 8456.8831728953. The cubic root of 71518873 is about 415.0880405461.

The spelling of 71518873 in words is "seventy-one million, five hundred eighteen thousand, eight hundred seventy-three".