381961 has 4 divisors (see below), whose sum is σ = 398592. Its totient is φ = 365332.

The previous prime is 381949. The next prime is 381977. The reversal of 381961 is 169183.

It is a happy number.

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 an emirpimes, since its reverse is a distinct semiprime: 169183 = 7 ⋅24169.

It is not a de Polignac number, because 381961 - 2¹¹ = 379913 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (381911) 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, 8281 + ... + 8326.

It is an arithmetic number, because the mean of its divisors is an integer number (99648).

2³⁸¹⁹⁶¹ is an apocalyptic number.

It is an amenable number.

381961 is a deficient number, since it is larger than the sum of its proper divisors (16631).

381961 is a wasteful number, since it uses less digits than its factorization.

381961 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16630.

The product of its digits is 1296, while the sum is 28.

The square root of 381961 is about 618.0299345501. The cubic root of 381961 is about 72.5559457196. Note that the first 3 decimals are identical.

The spelling of 381961 in words is "three hundred eighty-one thousand, nine hundred sixty-one".