381211217 has 4 divisors (see below), whose sum is σ = 381252720. Its totient is φ = 381169716.

The previous prime is 381211169. The next prime is 381211273. The reversal of 381211217 is 712112183.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 381211217 - 2⁸ = 381210961 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (381211277) 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, 167 + ... + 27612.

It is an arithmetic number, because the mean of its divisors is an integer number (95313180).

Almost surely, 2^381211217 is an apocalyptic number.

It is an amenable number.

381211217 is a deficient number, since it is larger than the sum of its proper divisors (41503).

381211217 is a wasteful number, since it uses less digits than its factorization.

381211217 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41502.

The product of its digits is 672, while the sum is 26.

The square root of 381211217 is about 19524.6310336457. The cubic root of 381211217 is about 725.0843925541.

The spelling of 381211217 in words is "three hundred eighty-one million, two hundred eleven thousand, two hundred seventeen".