99131 has 2 divisors, whose sum is σ = 99132. Its totient is φ = 99130.

The previous prime is 99119. The next prime is 99133. The reversal of 99131 is 13199.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-99131 is a prime.

It is a super-2 number, since 2×99131² = 19653910322, which contains 22 as substring.

Together with 99133, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 99097 and 99106.

It is not a weakly prime, because it can be changed into another prime (99133) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 49565 + 49566.

It is an arithmetic number, because the mean of its divisors is an integer number (49566).

2⁹⁹¹³¹ is an apocalyptic number.

99131 is a deficient number, since it is larger than the sum of its proper divisors (1).

99131 is an equidigital number, since it uses as much as digits as its factorization.

99131 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 243, while the sum is 23.

The square root of 99131 is about 314.8507582967. The cubic root of 99131 is about 46.2810456276.

The spelling of 99131 in words is "ninety-nine thousand, one hundred thirty-one".