99831397 has 2 divisors, whose sum is σ = 99831398. Its totient is φ = 99831396.

The previous prime is 99831371. The next prime is 99831419. The reversal of 99831397 is 79313899.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 98684356 + 1147041 = 9934^2 + 1071^2 .

It is a cyclic number.

It is not a de Polignac number, because 99831397 - 2¹¹ = 99829349 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 99831397.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (99831367) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 49915698 + 49915699.

It is an arithmetic number, because the mean of its divisors is an integer number (49915699).

Almost surely, 2^99831397 is an apocalyptic number.

It is an amenable number.

99831397 is a deficient number, since it is larger than the sum of its proper divisors (1).

99831397 is an equidigital number, since it uses as much as digits as its factorization.

99831397 is an evil number, because the sum of its binary digits is even.

The product of its digits is 367416, while the sum is 49.

The square root of 99831397 is about 9991.5662936298. The cubic root of 99831397 is about 463.8978746827.

The spelling of 99831397 in words is "ninety-nine million, eight hundred thirty-one thousand, three hundred ninety-seven".