381690899 has 2 divisors, whose sum is σ = 381690900. Its totient is φ = 381690898.

The previous prime is 381690877. The next prime is 381690961. The reversal of 381690899 is 998096183.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 381690899 - 2¹² = 381686803 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 381690899.

It is not a weakly prime, because it can be changed into another prime (381690839) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 190845449 + 190845450.

It is an arithmetic number, because the mean of its divisors is an integer number (190845450).

Almost surely, 2^381690899 is an apocalyptic number.

381690899 is a deficient number, since it is larger than the sum of its proper divisors (1).

381690899 is an equidigital number, since it uses as much as digits as its factorization.

381690899 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 839808, while the sum is 53.

The square root of 381690899 is about 19536.9111939426. The cubic root of 381690899 is about 725.3883921338.

The spelling of 381690899 in words is "three hundred eighty-one million, six hundred ninety thousand, eight hundred ninety-nine".