1206515515171 has 4 divisors (see below), whose sum is σ = 1208550111912. Its totient is φ = 1204480918432.

The previous prime is 1206515515157. The next prime is 1206515515217. The reversal of 1206515515171 is 1715155156021.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1206515515171 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1206515512171) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1017297481 + ... + 1017298666.

It is an arithmetic number, because the mean of its divisors is an integer number (302137527978).

Almost surely, 2^{1206515515171} is an apocalyptic number.

1206515515171 is a deficient number, since it is larger than the sum of its proper divisors (2034596741).

1206515515171 is an equidigital number, since it uses as much as digits as its factorization.

1206515515171 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2034596740.

The product of its (nonzero) digits is 52500, while the sum is 40.

The spelling of 1206515515171 in words is "one trillion, two hundred six billion, five hundred fifteen million, five hundred fifteen thousand, one hundred seventy-one".