98972591 has 4 divisors (see below), whose sum is σ = 99023400. Its totient is φ = 98921784.

The previous prime is 98972569. The next prime is 98972609. The reversal of 98972591 is 19527989.

It is a happy number.

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 98972591 - 2⁶ = 98972527 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (92972591) 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 3 ways as a sum of consecutive naturals, for example, 22361 + ... + 26418.

It is an arithmetic number, because the mean of its divisors is an integer number (24755850).

Almost surely, 2^98972591 is an apocalyptic number.

98972591 is a deficient number, since it is larger than the sum of its proper divisors (50809).

98972591 is a wasteful number, since it uses less digits than its factorization.

98972591 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50808.

The product of its digits is 408240, while the sum is 50.

The square root of 98972591 is about 9948.4969216460. The cubic root of 98972591 is about 462.5638047839.

The spelling of 98972591 in words is "ninety-eight million, nine hundred seventy-two thousand, five hundred ninety-one".