975978917 has 4 divisors (see below), whose sum is σ = 976049376. Its totient is φ = 975908460.

The previous prime is 975978907. The next prime is 975978931. The reversal of 975978917 is 719879579.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 719879579 = 71 ⋅10139149.

It is a cyclic number.

It is not a de Polignac number, because 975978917 - 2²⁸ = 707543461 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 975978917.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (975978907) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6809 + ... + 44702.

It is an arithmetic number, because the mean of its divisors is an integer number (244012344).

Almost surely, 2^975978917 is an apocalyptic number.

It is an amenable number.

975978917 is a deficient number, since it is larger than the sum of its proper divisors (70459).

975978917 is a wasteful number, since it uses less digits than its factorization.

975978917 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 70458.

The product of its digits is 10001880, while the sum is 62.

The square root of 975978917 is about 31240.6612766119. The cubic root of 975978917 is about 991.9279903098.

The spelling of 975978917 in words is "nine hundred seventy-five million, nine hundred seventy-eight thousand, nine hundred seventeen".