9971359787 has 4 divisors (see below), whose sum is σ = 9973905480. Its totient is φ = 9968814096.

The previous prime is 9971359781. The next prime is 9971359789. The reversal of 9971359787 is 7879531799.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 7879531799 = 313 ⋅25174223.

It is a cyclic number.

It is not a de Polignac number, because 9971359787 - 2¹⁰ = 9971358763 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (9971359781) 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, 1266962 + ... + 1274807.

It is an arithmetic number, because the mean of its divisors is an integer number (2493476370).

Almost surely, 2^9971359787 is an apocalyptic number.

9971359787 is a deficient number, since it is larger than the sum of its proper divisors (2545693).

9971359787 is a wasteful number, since it uses less digits than its factorization.

9971359787 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2545692.

The product of its digits is 30005640, while the sum is 65.

The square root of 9971359787 is about 99856.6962551836. The cubic root of 9971359787 is about 2152.3759410650.

The spelling of 9971359787 in words is "nine billion, nine hundred seventy-one million, three hundred fifty-nine thousand, seven hundred eighty-seven".