381543747251 has 2 divisors, whose sum is σ = 381543747252. Its totient is φ = 381543747250.

The previous prime is 381543747241. The next prime is 381543747287. The reversal of 381543747251 is 152747345183.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-381543747251 is a prime.

It is a Sophie Germain prime.

It is a self number, because there is not a number n which added to its sum of digits gives 381543747251.

It is not a weakly prime, because it can be changed into another prime (381543747241) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 190771873625 + 190771873626.

It is an arithmetic number, because the mean of its divisors is an integer number (190771873626).

Almost surely, 2^381543747251 is an apocalyptic number.

381543747251 is a deficient number, since it is larger than the sum of its proper divisors (1).

381543747251 is an equidigital number, since it uses as much as digits as its factorization.

381543747251 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2822400, while the sum is 50.

The spelling of 381543747251 in words is "three hundred eighty-one billion, five hundred forty-three million, seven hundred forty-seven thousand, two hundred fifty-one".