381873491 has 2 divisors, whose sum is σ = 381873492. Its totient is φ = 381873490.

The previous prime is 381873391. The next prime is 381873511. The reversal of 381873491 is 194378183.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 381873491 - 2²⁶ = 314764627 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (381873391) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 190936745 + 190936746.

It is an arithmetic number, because the mean of its divisors is an integer number (190936746).

Almost surely, 2^381873491 is an apocalyptic number.

381873491 is a deficient number, since it is larger than the sum of its proper divisors (1).

381873491 is an equidigital number, since it uses as much as digits as its factorization.

381873491 is an evil number, because the sum of its binary digits is even.

The product of its digits is 145152, while the sum is 44.

The square root of 381873491 is about 19541.5836359288. The cubic root of 381873491 is about 725.5040433086.

The spelling of 381873491 in words is "three hundred eighty-one million, eight hundred seventy-three thousand, four hundred ninety-one".