972784517 has 4 divisors (see below), whose sum is σ = 1015079520. Its totient is φ = 930489516.

The previous prime is 972784511. The next prime is 972784541. The reversal of 972784517 is 715487279.

It is a happy number.

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.

It is a cyclic number.

It is not a de Polignac number, because 972784517 - 2⁸ = 972784261 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (972784511) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21147467 + ... + 21147512.

It is an arithmetic number, because the mean of its divisors is an integer number (253769880).

Almost surely, 2^972784517 is an apocalyptic number.

It is an amenable number.

972784517 is a deficient number, since it is larger than the sum of its proper divisors (42295003).

972784517 is a wasteful number, since it uses less digits than its factorization.

972784517 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42295002.

The product of its digits is 987840, while the sum is 50.

The square root of 972784517 is about 31189.4936957944. The cubic root of 972784517 is about 990.8446069162.

The spelling of 972784517 in words is "nine hundred seventy-two million, seven hundred eighty-four thousand, five hundred seventeen".