105997491 has 10 divisors (see below), whose sum is σ = 158342052. Its totient is φ = 70664940.

The previous prime is 105997481. The next prime is 105997511. The reversal of 105997491 is 194799501.

105997491 is a `hidden beast` number, since 10 + 599 + 7 + 49 + 1 = 666.

It is not a de Polignac number, because 105997491 - 2²¹ = 103900339 is a prime.

It is a super-2 number, since 2×105997491² = 22470936196590162, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (105997421) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 654225 + ... + 654386.

Almost surely, 2^105997491 is an apocalyptic number.

105997491 is a deficient number, since it is larger than the sum of its proper divisors (52344561).

105997491 is an equidigital number, since it uses as much as digits as its factorization.

105997491 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1308623 (or 1308614 counting only the distinct ones).

The product of its (nonzero) digits is 102060, while the sum is 45.

The square root of 105997491 is about 10295.5082924545. The cubic root of 105997491 is about 473.2586150767.

The spelling of 105997491 in words is "one hundred five million, nine hundred ninety-seven thousand, four hundred ninety-one".