381659497 has 2 divisors, whose sum is σ = 381659498. Its totient is φ = 381659496.

The previous prime is 381659491. The next prime is 381659521. The reversal of 381659497 is 794956183.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 235346281 + 146313216 = 15341^2 + 12096^2 .

It is a cyclic number.

It is not a de Polignac number, because 381659497 - 2³ = 381659489 is a prime.

It is not a weakly prime, because it can be changed into another prime (381659491) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 190829748 + 190829749.

It is an arithmetic number, because the mean of its divisors is an integer number (190829749).

Almost surely, 2^381659497 is an apocalyptic number.

It is an amenable number.

381659497 is a deficient number, since it is larger than the sum of its proper divisors (1).

381659497 is an equidigital number, since it uses as much as digits as its factorization.

381659497 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1632960, while the sum is 52.

The square root of 381659497 is about 19536.1075191554. The cubic root of 381659497 is about 725.3684988371.

The spelling of 381659497 in words is "three hundred eighty-one million, six hundred fifty-nine thousand, four hundred ninety-seven".