105953981 has 4 divisors (see below), whose sum is σ = 121090272. Its totient is φ = 90817692.

The previous prime is 105953971. The next prime is 105953999. The reversal of 105953981 is 189359501.

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 not a de Polignac number, because 105953981 - 2¹⁸ = 105691837 is a prime.

It is a super-2 number, since 2×105953981² = 22452492179496722, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (105953971) 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, 7568135 + ... + 7568148.

It is an arithmetic number, because the mean of its divisors is an integer number (30272568).

Almost surely, 2^105953981 is an apocalyptic number.

It is an amenable number.

105953981 is a deficient number, since it is larger than the sum of its proper divisors (15136291).

105953981 is an equidigital number, since it uses as much as digits as its factorization.

105953981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15136290.

The product of its (nonzero) digits is 48600, while the sum is 41.

The square root of 105953981 is about 10293.3950181658. The cubic root of 105953981 is about 473.1938515926.

The spelling of 105953981 in words is "one hundred five million, nine hundred fifty-three thousand, nine hundred eighty-one".