381112121 has 4 divisors (see below), whose sum is σ = 410428452. Its totient is φ = 351795792.

The previous prime is 381112117. The next prime is 381112133. The reversal of 381112121 is 121211183.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 23145721 + 357966400 = 4811^2 + 18920^2 .

It is a cyclic number.

It is not a de Polignac number, because 381112121 - 2² = 381112117 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 381112093 and 381112102.

It is not an unprimeable number, because it can be changed into a prime (381112111) 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, 14658146 + ... + 14658171.

It is an arithmetic number, because the mean of its divisors is an integer number (102607113).

Almost surely, 2^381112121 is an apocalyptic number.

It is an amenable number.

381112121 is a deficient number, since it is larger than the sum of its proper divisors (29316331).

381112121 is a wasteful number, since it uses less digits than its factorization.

381112121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29316330.

The product of its digits is 96, while the sum is 20.

The square root of 381112121 is about 19522.0931510942. The cubic root of 381112121 is about 725.0215584552.

The spelling of 381112121 in words is "three hundred eighty-one million, one hundred twelve thousand, one hundred twenty-one".