9940917197 has 2 divisors, whose sum is σ = 9940917198. Its totient is φ = 9940917196.

The previous prime is 9940917137. The next prime is 9940917209. The reversal of 9940917197 is 7917190499.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 7078025161 + 2862892036 = 84131^2 + 53506^2 .

It is a cyclic number.

It is not a de Polignac number, because 9940917197 - 2¹⁰ = 9940916173 is a prime.

It is a super-2 number, since 2×9940917197² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (9940917137) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4970458598 + 4970458599.

It is an arithmetic number, because the mean of its divisors is an integer number (4970458599).

Almost surely, 2^9940917197 is an apocalyptic number.

It is an amenable number.

9940917197 is a deficient number, since it is larger than the sum of its proper divisors (1).

9940917197 is an equidigital number, since it uses as much as digits as its factorization.

9940917197 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1285956, while the sum is 56.

The square root of 9940917197 is about 99704.1483439882. The cubic root of 9940917197 is about 2150.1833048689.

The spelling of 9940917197 in words is "nine billion, nine hundred forty million, nine hundred seventeen thousand, one hundred ninety-seven".