109558981 has 4 divisors (see below), whose sum is σ = 125210272. Its totient is φ = 93907692.

The previous prime is 109558979. The next prime is 109558987. The reversal of 109558981 is 189855901.

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: 189855901 = 211 ⋅899791.

It is a cyclic number.

It is not a de Polignac number, because 109558981 - 2¹ = 109558979 is a prime.

It is a super-2 number, since 2×109558981² = 24006340635516722, 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 (109558987) 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, 7825635 + ... + 7825648.

It is an arithmetic number, because the mean of its divisors is an integer number (31302568).

Almost surely, 2^109558981 is an apocalyptic number.

It is an amenable number.

109558981 is a deficient number, since it is larger than the sum of its proper divisors (15651291).

109558981 is an equidigital number, since it uses as much as digits as its factorization.

109558981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15651290.

The product of its (nonzero) digits is 129600, while the sum is 46.

The square root of 109558981 is about 10467.0426100212. The cubic root of 109558981 is about 478.5007925238.

The spelling of 109558981 in words is "one hundred nine million, five hundred fifty-eight thousand, nine hundred eighty-one".