381697777 has 2 divisors, whose sum is σ = 381697778. Its totient is φ = 381697776.

The previous prime is 381697759. The next prime is 381697781. The reversal of 381697777 is 777796183.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 341362576 + 40335201 = 18476^2 + 6351^2 .

It is an emirp because it is prime and its reverse (777796183) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-381697777 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (381697717) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 190848888 + 190848889.

It is an arithmetic number, because the mean of its divisors is an integer number (190848889).

Almost surely, 2^381697777 is an apocalyptic number.

It is an amenable number.

381697777 is a deficient number, since it is larger than the sum of its proper divisors (1).

381697777 is an equidigital number, since it uses as much as digits as its factorization.

381697777 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3111696, while the sum is 55.

The square root of 381697777 is about 19537.0872189280. The cubic root of 381697777 is about 725.3927492296.

The spelling of 381697777 in words is "three hundred eighty-one million, six hundred ninety-seven thousand, seven hundred seventy-seven".