105920987 has 4 divisors (see below), whose sum is σ = 105979296. Its totient is φ = 105862680.

The previous prime is 105920981. The next prime is 105921001. The reversal of 105920987 is 789029501.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 789029501 = 13 ⋅60694577.

It is a cyclic number.

It is not a de Polignac number, because 105920987 - 2¹⁸ = 105658843 is a prime.

It is a super-2 number, since 2×105920987² = 22438510974108338, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (105920981) 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, 26339 + ... + 30092.

It is an arithmetic number, because the mean of its divisors is an integer number (26494824).

Almost surely, 2^105920987 is an apocalyptic number.

105920987 is a deficient number, since it is larger than the sum of its proper divisors (58309).

105920987 is an equidigital number, since it uses as much as digits as its factorization.

105920987 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 58308.

The product of its (nonzero) digits is 45360, while the sum is 41.

The square root of 105920987 is about 10291.7922151586. The cubic root of 105920987 is about 473.1447290753.

The spelling of 105920987 in words is "one hundred five million, nine hundred twenty thousand, nine hundred eighty-seven".