99801131 has 2 divisors, whose sum is σ = 99801132. Its totient is φ = 99801130.

The previous prime is 99801127. The next prime is 99801139. The reversal of 99801131 is 13110899.

It is a weak prime.

It is an emirp because it is prime and its reverse (13110899) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 99801131 - 2² = 99801127 is a prime.

It is a super-2 number, since 2×99801131² = 19920531497758322, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (99801139) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 49900565 + 49900566.

It is an arithmetic number, because the mean of its divisors is an integer number (49900566).

Almost surely, 2^99801131 is an apocalyptic number.

99801131 is a deficient number, since it is larger than the sum of its proper divisors (1).

99801131 is an equidigital number, since it uses as much as digits as its factorization.

99801131 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1944, while the sum is 32.

The square root of 99801131 is about 9990.0516014683. The cubic root of 99801131 is about 463.8509897928.

It can be divided in two parts, 9980 and 1131, that added together give a palindrome (11111).

The spelling of 99801131 in words is "ninety-nine million, eight hundred one thousand, one hundred thirty-one".