381251729 has 2 divisors, whose sum is σ = 381251730. Its totient is φ = 381251728.

The previous prime is 381251723. The next prime is 381251747. The reversal of 381251729 is 927152183.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 363779329 + 17472400 = 19073^2 + 4180^2 .

It is an emirp because it is prime and its reverse (927152183) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 381251729 - 2⁴ = 381251713 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 381251692 and 381251701.

It is not a weakly prime, because it can be changed into another prime (381251723) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 190625864 + 190625865.

It is an arithmetic number, because the mean of its divisors is an integer number (190625865).

Almost surely, 2^381251729 is an apocalyptic number.

It is an amenable number.

381251729 is a deficient number, since it is larger than the sum of its proper divisors (1).

381251729 is an equidigital number, since it uses as much as digits as its factorization.

381251729 is an evil number, because the sum of its binary digits is even.

The product of its digits is 30240, while the sum is 38.

The square root of 381251729 is about 19525.6684648695. The cubic root of 381251729 is about 725.1100769841.

The spelling of 381251729 in words is "three hundred eighty-one million, two hundred fifty-one thousand, seven hundred twenty-nine".