98158981 has 4 divisors (see below), whose sum is σ = 100441792. Its totient is φ = 95876172.

The previous prime is 98158979. The next prime is 98158987. The reversal of 98158981 is 18985189.

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, and also an emirpimes, since its reverse is a distinct semiprime: 18985189 = 23 ⋅825443.

It is a cyclic number.

It is not a de Polignac number, because 98158981 - 2¹ = 98158979 is a prime.

It is a super-2 number, since 2×98158981² = 19270371101916722, 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 (98158987) 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, 1141341 + ... + 1141426.

It is an arithmetic number, because the mean of its divisors is an integer number (25110448).

Almost surely, 2^98158981 is an apocalyptic number.

It is an amenable number.

98158981 is a deficient number, since it is larger than the sum of its proper divisors (2282811).

98158981 is a wasteful number, since it uses less digits than its factorization.

98158981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2282810.

The product of its digits is 207360, while the sum is 49.

The square root of 98158981 is about 9907.5214357578. The cubic root of 98158981 is about 461.2928046389.

The spelling of 98158981 in words is "ninety-eight million, one hundred fifty-eight thousand, nine hundred eighty-one".