381261791249 has 2 divisors, whose sum is σ = 381261791250. Its totient is φ = 381261791248.

The previous prime is 381261791233. The next prime is 381261791327. The reversal of 381261791249 is 942197162183.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 278177130625 + 103084660624 = 527425^2 + 321068^2 .

It is a cyclic number.

It is not a de Polignac number, because 381261791249 - 2⁴ = 381261791233 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 381261791249.

It is not a weakly prime, because it can be changed into another prime (381261791149) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 190630895624 + 190630895625.

It is an arithmetic number, because the mean of its divisors is an integer number (190630895625).

Almost surely, 2^381261791249 is an apocalyptic number.

It is an amenable number.

381261791249 is a deficient number, since it is larger than the sum of its proper divisors (1).

381261791249 is an equidigital number, since it uses as much as digits as its factorization.

381261791249 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1306368, while the sum is 53.

The spelling of 381261791249 in words is "three hundred eighty-one billion, two hundred sixty-one million, seven hundred ninety-one thousand, two hundred forty-nine".