71516505 has 32 divisors (see below), whose sum is σ = 118460160. Its totient is φ = 36817920.

The previous prime is 71516503. The next prime is 71516519. The reversal of 71516505 is 50561517.

It is not a de Polignac number, because 71516505 - 2¹ = 71516503 is a prime.

It is a super-2 number, since 2×71516505² = 10229220974830050, which contains 22 as substring.

It is a Smith number, since the sum of its digits (30) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (71516503) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 62781 + ... + 63909.

It is an arithmetic number, because the mean of its divisors is an integer number (3701880).

Almost surely, 2^71516505 is an apocalyptic number.

It is an amenable number.

71516505 is a deficient number, since it is larger than the sum of its proper divisors (46943655).

71516505 is a wasteful number, since it uses less digits than its factorization.

71516505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1281.

The product of its (nonzero) digits is 5250, while the sum is 30.

The square root of 71516505 is about 8456.7431674375. The cubic root of 71516505 is about 415.0834592876.

The spelling of 71516505 in words is "seventy-one million, five hundred sixteen thousand, five hundred five".