71512817 has 2 divisors, whose sum is σ = 71512818. Its totient is φ = 71512816.

The previous prime is 71512787. The next prime is 71512853. The reversal of 71512817 is 71821517.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 64705936 + 6806881 = 8044^2 + 2609^2 .

It is a cyclic number.

It is not a de Polignac number, because 71512817 - 2¹⁰ = 71511793 is a prime.

It is a super-2 number, since 2×71512817² = 10228165990550978, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (71512117) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35756408 + 35756409.

It is an arithmetic number, because the mean of its divisors is an integer number (35756409).

Almost surely, 2^71512817 is an apocalyptic number.

It is an amenable number.

71512817 is a deficient number, since it is larger than the sum of its proper divisors (1).

71512817 is an equidigital number, since it uses as much as digits as its factorization.

71512817 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3920, while the sum is 32.

The square root of 71512817 is about 8456.5251137805. The cubic root of 71512817 is about 415.0763240857.

The spelling of 71512817 in words is "seventy-one million, five hundred twelve thousand, eight hundred seventeen".