98731557281 has 4 divisors (see below), whose sum is σ = 112836065472. Its totient is φ = 84627049092.

The previous prime is 98731557251. The next prime is 98731557293. The reversal of 98731557281 is 18275513789.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 98731557281 - 2⁶ = 98731557217 is a prime.

It is a super-2 number, since 2×98731557281² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (98731557241) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7052254085 + ... + 7052254098.

It is an arithmetic number, because the mean of its divisors is an integer number (28209016368).

Almost surely, 2^98731557281 is an apocalyptic number.

It is an amenable number.

98731557281 is a deficient number, since it is larger than the sum of its proper divisors (14104508191).

98731557281 is a wasteful number, since it uses less digits than its factorization.

98731557281 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14104508190.

The product of its digits is 4233600, while the sum is 56.

The spelling of 98731557281 in words is "ninety-eight billion, seven hundred thirty-one million, five hundred fifty-seven thousand, two hundred eighty-one".