98561891 has 8 divisors (see below), whose sum is σ = 102362304. Its totient is φ = 94830120.

The previous prime is 98561857. The next prime is 98561917. The reversal of 98561891 is 19816589.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-98561891 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (98561791) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 14225 + ... + 19986.

It is an arithmetic number, because the mean of its divisors is an integer number (12795288).

Almost surely, 2^98561891 is an apocalyptic number.

98561891 is a deficient number, since it is larger than the sum of its proper divisors (3800413).

98561891 is a wasteful number, since it uses less digits than its factorization.

98561891 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34321.

The product of its digits is 155520, while the sum is 47.

The square root of 98561891 is about 9927.8341545374. The cubic root of 98561891 is about 461.9230942745.

The spelling of 98561891 in words is "ninety-eight million, five hundred sixty-one thousand, eight hundred ninety-one".