381099 has 4 divisors (see below), whose sum is σ = 508136. Its totient is φ = 254064.

The previous prime is 381097. The next prime is 381103. The reversal of 381099 is 990183.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 990183 = 3 ⋅330061.

It is not a de Polignac number, because 381099 - 2¹ = 381097 is a prime.

It is a D-number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (381097) 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, 63514 + ... + 63519.

It is an arithmetic number, because the mean of its divisors is an integer number (127034).

2³⁸¹⁰⁹⁹ is an apocalyptic number.

381099 is a deficient number, since it is larger than the sum of its proper divisors (127037).

381099 is a wasteful number, since it uses less digits than its factorization.

381099 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 127036.

The product of its (nonzero) digits is 1944, while the sum is 30.

The square root of 381099 is about 617.3321634258. The cubic root of 381099 is about 72.5013237967.

The spelling of 381099 in words is "three hundred eighty-one thousand, ninety-nine".