381765653 has 4 divisors (see below), whose sum is σ = 390643968. Its totient is φ = 372887340.

The previous prime is 381765623. The next prime is 381765677. The reversal of 381765653 is 356567183.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-381765653 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (381765623) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4439093 + ... + 4439178.

It is an arithmetic number, because the mean of its divisors is an integer number (97660992).

Almost surely, 2^381765653 is an apocalyptic number.

It is an amenable number.

381765653 is a deficient number, since it is larger than the sum of its proper divisors (8878315).

381765653 is an equidigital number, since it uses as much as digits as its factorization.

381765653 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8878314.

The product of its digits is 453600, while the sum is 44.

The square root of 381765653 is about 19538.8242481476. The cubic root of 381765653 is about 725.4357447119.

The spelling of 381765653 in words is "three hundred eighty-one million, seven hundred sixty-five thousand, six hundred fifty-three".