381018493 has 2 divisors, whose sum is σ = 381018494. Its totient is φ = 381018492.

The previous prime is 381018413. The next prime is 381018497. The reversal of 381018493 is 394810183.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 190937124 + 190081369 = 13818^2 + 13787^2 .

It is an emirp because it is prime and its reverse (394810183) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 381018493 - 2⁹ = 381017981 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (381018497) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 190509246 + 190509247.

It is an arithmetic number, because the mean of its divisors is an integer number (190509247).

Almost surely, 2^381018493 is an apocalyptic number.

It is an amenable number.

381018493 is a deficient number, since it is larger than the sum of its proper divisors (1).

381018493 is an equidigital number, since it uses as much as digits as its factorization.

381018493 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 20736, while the sum is 37.

The square root of 381018493 is about 19519.6950027402. The cubic root of 381018493 is about 724.9621814597.

The spelling of 381018493 in words is "three hundred eighty-one million, eighteen thousand, four hundred ninety-three".