98126181209891 has 4 divisors (see below), whose sum is σ = 98127338292984. Its totient is φ = 98125024126800.

The previous prime is 98126181209873. The next prime is 98126181209897. The reversal of 98126181209891 is 19890218162189.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 98126181209891 - 2³⁸ = 97851303302947 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (98126181209897) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 578414330 + ... + 578583951.

It is an arithmetic number, because the mean of its divisors is an integer number (24531834573246).

Almost surely, 2^{98126181209891} is an apocalyptic number.

98126181209891 is a deficient number, since it is larger than the sum of its proper divisors (1157083093).

98126181209891 is a wasteful number, since it uses less digits than its factorization.

98126181209891 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1157083092.

The product of its (nonzero) digits is 8957952, while the sum is 65.

Adding to 98126181209891 its sum of digits (65), we get a square (98126181209956 = 9905866²).

The spelling of 98126181209891 in words is "ninety-eight trillion, one hundred twenty-six billion, one hundred eighty-one million, two hundred nine thousand, eight hundred ninety-one".