100381643 has 4 divisors (see below), whose sum is σ = 101756808. Its totient is φ = 99006480.

The previous prime is 100381639. The next prime is 100381649. The reversal of 100381643 is 346183001.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 346183001 = 1787 ⋅193723.

It is a cyclic number.

It is not a de Polignac number, because 100381643 - 2² = 100381639 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (100381649) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 687473 + ... + 687618.

It is an arithmetic number, because the mean of its divisors is an integer number (25439202).

Almost surely, 2^100381643 is an apocalyptic number.

100381643 is a deficient number, since it is larger than the sum of its proper divisors (1375165).

100381643 is an equidigital number, since it uses as much as digits as its factorization.

100381643 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1375164.

The product of its (nonzero) digits is 1728, while the sum is 26.

The square root of 100381643 is about 10019.0639782367. The cubic root of 100381643 is about 464.7486104081.

The spelling of 100381643 in words is "one hundred million, three hundred eighty-one thousand, six hundred forty-three".