381162217 has 4 divisors (see below), whose sum is σ = 381201876. Its totient is φ = 381122560.

The previous prime is 381162193. The next prime is 381162227. The reversal of 381162217 is 712261183.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 86044176 + 295118041 = 9276^2 + 17179^2 .

It is a cyclic number.

It is not a de Polignac number, because 381162217 - 2¹⁵ = 381129449 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (381162227) 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, 4713 + ... + 28009.

It is an arithmetic number, because the mean of its divisors is an integer number (95300469).

Almost surely, 2^381162217 is an apocalyptic number.

It is an amenable number.

381162217 is a deficient number, since it is larger than the sum of its proper divisors (39659).

381162217 is a wasteful number, since it uses less digits than its factorization.

381162217 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39658.

The product of its digits is 4032, while the sum is 31.

The square root of 381162217 is about 19523.3761680709. The cubic root of 381162217 is about 725.0533243379.

The spelling of 381162217 in words is "three hundred eighty-one million, one hundred sixty-two thousand, two hundred seventeen".