381516899 has 2 divisors, whose sum is σ = 381516900. Its totient is φ = 381516898.

The previous prime is 381516869. The next prime is 381516913. The reversal of 381516899 is 998615183.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 381516899 - 2⁸ = 381516643 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (381516829) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 190758449 + 190758450.

It is an arithmetic number, because the mean of its divisors is an integer number (190758450).

Almost surely, 2^381516899 is an apocalyptic number.

381516899 is a deficient number, since it is larger than the sum of its proper divisors (1).

381516899 is an equidigital number, since it uses as much as digits as its factorization.

381516899 is an evil number, because the sum of its binary digits is even.

The product of its digits is 466560, while the sum is 50.

The square root of 381516899 is about 19532.4575770690. The cubic root of 381516899 is about 725.2781486839.

The spelling of 381516899 in words is "three hundred eighty-one million, five hundred sixteen thousand, eight hundred ninety-nine".