9997144931 has 2 divisors, whose sum is σ = 9997144932. Its totient is φ = 9997144930.

The previous prime is 9997144921. The next prime is 9997144987. The reversal of 9997144931 is 1394417999.

9997144931 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is an a-pointer prime, because the next prime (9997144987) can be obtained adding 9997144931 to its sum of digits (56).

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-9997144931 is a prime.

It is a super-2 number, since 2×9997144931² (a number of 21 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (9997144921) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4998572465 + 4998572466.

It is an arithmetic number, because the mean of its divisors is an integer number (4998572466).

Almost surely, 2^9997144931 is an apocalyptic number.

9997144931 is a deficient number, since it is larger than the sum of its proper divisors (1).

9997144931 is an equidigital number, since it uses as much as digits as its factorization.

9997144931 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2204496, while the sum is 56.

The square root of 9997144931 is about 99985.7236359271. The cubic root of 9997144931 is about 2154.2296351926.

The spelling of 9997144931 in words is "nine billion, nine hundred ninety-seven million, one hundred forty-four thousand, nine hundred thirty-one".