381947872409 has 2 divisors, whose sum is σ = 381947872410. Its totient is φ = 381947872408.

The previous prime is 381947872373. The next prime is 381947872417. The reversal of 381947872409 is 904278749183.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 375548352400 + 6399520009 = 612820^2 + 79997^2 .

It is a cyclic number.

It is not a de Polignac number, because 381947872409 - 2²⁰ = 381946823833 is a prime.

It is not a weakly prime, because it can be changed into another prime (381947872909) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 190973936204 + 190973936205.

It is an arithmetic number, because the mean of its divisors is an integer number (190973936205).

Almost surely, 2^381947872409 is an apocalyptic number.

It is an amenable number.

381947872409 is a deficient number, since it is larger than the sum of its proper divisors (1).

381947872409 is an equidigital number, since it uses as much as digits as its factorization.

381947872409 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 24385536, while the sum is 62.

The spelling of 381947872409 in words is "three hundred eighty-one billion, nine hundred forty-seven million, eight hundred seventy-two thousand, four hundred nine".