9997831 has 2 divisors, whose sum is σ = 9997832. Its totient is φ = 9997830.

The previous prime is 9997829. The next prime is 9997859. The reversal of 9997831 is 1387999.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 9997831 - 2¹ = 9997829 is a prime.

It is a super-2 number, since 2×9997831² = 199913249409122, which contains 22 as substring.

Together with 9997829, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (9995831) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4998915 + 4998916.

It is an arithmetic number, because the mean of its divisors is an integer number (4998916).

Almost surely, 2^9997831 is an apocalyptic number.

9997831 is a deficient number, since it is larger than the sum of its proper divisors (1).

9997831 is an equidigital number, since it uses as much as digits as its factorization.

9997831 is an evil number, because the sum of its binary digits is even.

The product of its digits is 122472, while the sum is 46.

The square root of 9997831 is about 3161.9346925577. The cubic root of 9997831 is about 215.4278913141.

The spelling of 9997831 in words is "nine million, nine hundred ninety-seven thousand, eight hundred thirty-one".