71516905 has 8 divisors (see below), whose sum is σ = 86114952. Its totient is φ = 57017088.

The previous prime is 71516903. The next prime is 71516927. The reversal of 71516905 is 50961517.

It can be written as a sum of positive squares in 4 ways, for example, as 18939904 + 52577001 = 4352^2 + 7251^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 71516905 - 2¹ = 71516903 is a prime.

It is a super-2 number, since 2×71516905² = 10229335401558050, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (71516903) 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 in 7 ways as a sum of consecutive naturals, for example, 22944 + ... + 25873.

It is an arithmetic number, because the mean of its divisors is an integer number (10764369).

Almost surely, 2^71516905 is an apocalyptic number.

It is an amenable number.

71516905 is a deficient number, since it is larger than the sum of its proper divisors (14598047).

71516905 is a wasteful number, since it uses less digits than its factorization.

71516905 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 49115.

The product of its (nonzero) digits is 9450, while the sum is 34.

The square root of 71516905 is about 8456.7668171707. The cubic root of 71516905 is about 415.0842331559.

The spelling of 71516905 in words is "seventy-one million, five hundred sixteen thousand, nine hundred five".