99126781 has 12 divisors (see below), whose sum is σ = 112991520. Its totient is φ = 86682960.

The previous prime is 99126767. The next prime is 99126823. The reversal of 99126781 is 18762199.

It is not a de Polignac number, because 99126781 - 2⁵ = 99126749 is a prime.

It is a super-2 number, since 2×99126781² = 19652237422843922, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (99129781) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 12225 + ... + 18646.

It is an arithmetic number, because the mean of its divisors is an integer number (9415960).

Almost surely, 2^99126781 is an apocalyptic number.

It is an amenable number.

99126781 is a deficient number, since it is larger than the sum of its proper divisors (13864739).

99126781 is a wasteful number, since it uses less digits than its factorization.

99126781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30916 (or 30903 counting only the distinct ones).

The product of its digits is 54432, while the sum is 43.

The square root of 99126781 is about 9956.2433176374. The cubic root of 99126781 is about 462.8038904693.

It can be divided in two parts, 991 and 26781, that added together give a palindrome (27772).

The spelling of 99126781 in words is "ninety-nine million, one hundred twenty-six thousand, seven hundred eighty-one".