381239641 has 2 divisors, whose sum is σ = 381239642. Its totient is φ = 381239640.

The previous prime is 381239611. The next prime is 381239659. The reversal of 381239641 is 146932183.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 302029641 + 79210000 = 17379^2 + 8900^2 .

It is a cyclic number.

It is not a de Polignac number, because 381239641 - 2⁹ = 381239129 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 381239641.

It is not a weakly prime, because it can be changed into another prime (381239611) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 190619820 + 190619821.

It is an arithmetic number, because the mean of its divisors is an integer number (190619821).

Almost surely, 2^381239641 is an apocalyptic number.

It is an amenable number.

381239641 is a deficient number, since it is larger than the sum of its proper divisors (1).

381239641 is an equidigital number, since it uses as much as digits as its factorization.

381239641 is an evil number, because the sum of its binary digits is even.

The product of its digits is 31104, while the sum is 37.

The square root of 381239641 is about 19525.3589211569. The cubic root of 381239641 is about 725.1024134357.

The spelling of 381239641 in words is "three hundred eighty-one million, two hundred thirty-nine thousand, six hundred forty-one".