9970919687 has 4 divisors (see below), whose sum is σ = 9971344680. Its totient is φ = 9970494696.

The previous prime is 9970919633. The next prime is 9970919689. The reversal of 9970919687 is 7869190799.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 7869190799 = 109 ⋅72194411.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-9970919687 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 (9970919689) 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, 175112 + ... + 224957.

It is an arithmetic number, because the mean of its divisors is an integer number (2492836170).

Almost surely, 2^9970919687 is an apocalyptic number.

9970919687 is a deficient number, since it is larger than the sum of its proper divisors (424993).

9970919687 is a wasteful number, since it uses less digits than its factorization.

9970919687 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 424992.

The product of its (nonzero) digits is 15431472, while the sum is 65.

The square root of 9970919687 is about 99854.4925729434. The cubic root of 9970919687 is about 2152.3442745518.

The spelling of 9970919687 in words is "nine billion, nine hundred seventy million, nine hundred nineteen thousand, six hundred eighty-seven".