381757997 has 2 divisors, whose sum is σ = 381757998. Its totient is φ = 381757996.

The previous prime is 381757951. The next prime is 381758021. The reversal of 381757997 is 799757183.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 361228036 + 20529961 = 19006^2 + 4531^2 .

It is a cyclic number.

It is not a de Polignac number, because 381757997 - 2²⁰ = 380709421 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (381757927) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 190878998 + 190878999.

It is an arithmetic number, because the mean of its divisors is an integer number (190878999).

Almost surely, 2^381757997 is an apocalyptic number.

It is an amenable number.

381757997 is a deficient number, since it is larger than the sum of its proper divisors (1).

381757997 is an equidigital number, since it uses as much as digits as its factorization.

381757997 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3333960, while the sum is 56.

The square root of 381757997 is about 19538.6283295425. The cubic root of 381757997 is about 725.4308953379.

The spelling of 381757997 in words is "three hundred eighty-one million, seven hundred fifty-seven thousand, nine hundred ninety-seven".