971685515 has 16 divisors (see below), whose sum is σ = 1177992288. Its totient is φ = 769403136.

The previous prime is 971685493. The next prime is 971685521. The reversal of 971685515 is 515586179.

It is a cyclic number.

It is not a de Polignac number, because 971685515 - 2¹² = 971681419 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 971685515.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 253604 + ... + 257406.

It is an arithmetic number, because the mean of its divisors is an integer number (73624518).

Almost surely, 2^971685515 is an apocalyptic number.

971685515 is a deficient number, since it is larger than the sum of its proper divisors (206306773).

971685515 is a wasteful number, since it uses less digits than its factorization.

971685515 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4318.

The product of its digits is 378000, while the sum is 47.

The square root of 971685515 is about 31171.8705726814. The cubic root of 971685515 is about 990.4713311909.

The spelling of 971685515 in words is "nine hundred seventy-one million, six hundred eighty-five thousand, five hundred fifteen".