381211689 has 32 divisors (see below), whose sum is σ = 552407040. Its totient is φ = 232923392.

The previous prime is 381211661. The next prime is 381211697. The reversal of 381211689 is 986112183.

It is not a de Polignac number, because 381211689 - 2⁷ = 381211561 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (381211289) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 860302 + ... + 860744.

It is an arithmetic number, because the mean of its divisors is an integer number (17262720).

Almost surely, 2^381211689 is an apocalyptic number.

It is an amenable number.

381211689 is a deficient number, since it is larger than the sum of its proper divisors (171195351).

381211689 is a wasteful number, since it uses less digits than its factorization.

381211689 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 869.

The product of its digits is 20736, while the sum is 39.

The square root of 381211689 is about 19524.6431209382. The cubic root of 381211689 is about 725.0846918106.

The spelling of 381211689 in words is "three hundred eighty-one million, two hundred eleven thousand, six hundred eighty-nine".