381636293 has 2 divisors, whose sum is σ = 381636294. Its totient is φ = 381636292.

The previous prime is 381636271. The next prime is 381636329. The reversal of 381636293 is 392636183.

Together with next prime (381636329) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 371795524 + 9840769 = 19282^2 + 3137^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-381636293 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 381636293.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (381633293) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 190818146 + 190818147.

It is an arithmetic number, because the mean of its divisors is an integer number (190818147).

Almost surely, 2^381636293 is an apocalyptic number.

It is an amenable number.

381636293 is a deficient number, since it is larger than the sum of its proper divisors (1).

381636293 is an equidigital number, since it uses as much as digits as its factorization.

381636293 is an evil number, because the sum of its binary digits is even.

The product of its digits is 139968, while the sum is 41.

The square root of 381636293 is about 19535.5136354282. The cubic root of 381636293 is about 725.3537983061.

The spelling of 381636293 in words is "three hundred eighty-one million, six hundred thirty-six thousand, two hundred ninety-three".