381810109 has 2 divisors, whose sum is σ = 381810110. Its totient is φ = 381810108.

The previous prime is 381810071. The next prime is 381810127. The reversal of 381810109 is 901018183.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 351450009 + 30360100 = 18747^2 + 5510^2 .

It is a cyclic number.

It is not a de Polignac number, because 381810109 - 2¹¹ = 381808061 is a prime.

It is an alternating number because its digits alternate between odd and even.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (381850109) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 190905054 + 190905055.

It is an arithmetic number, because the mean of its divisors is an integer number (190905055).

Almost surely, 2^381810109 is an apocalyptic number.

It is an amenable number.

381810109 is a deficient number, since it is larger than the sum of its proper divisors (1).

381810109 is an equidigital number, since it uses as much as digits as its factorization.

381810109 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1728, while the sum is 31.

The square root of 381810109 is about 19539.9618474551. The cubic root of 381810109 is about 725.4639022298.

The spelling of 381810109 in words is "three hundred eighty-one million, eight hundred ten thousand, one hundred nine".