381953081 has 2 divisors, whose sum is σ = 381953082. Its totient is φ = 381953080.

The previous prime is 381953057. The next prime is 381953083. The reversal of 381953081 is 180359183.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 381850681 + 102400 = 19541^2 + 320^2 .

It is a cyclic number.

It is not a de Polignac number, because 381953081 - 2⁶ = 381953017 is a prime.

It is a super-2 number, since 2×381953081² = 291776312170785122, which contains 22 as substring.

Together with 381953083, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (381953083) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 190976540 + 190976541.

It is an arithmetic number, because the mean of its divisors is an integer number (190976541).

Almost surely, 2^381953081 is an apocalyptic number.

It is an amenable number.

381953081 is a deficient number, since it is larger than the sum of its proper divisors (1).

381953081 is an equidigital number, since it uses as much as digits as its factorization.

381953081 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 25920, while the sum is 38.

The square root of 381953081 is about 19543.6199563950. The cubic root of 381953081 is about 725.5544429453.

The spelling of 381953081 in words is "three hundred eighty-one million, nine hundred fifty-three thousand, eighty-one".