381457131877 has 2 divisors, whose sum is σ = 381457131878. Its totient is φ = 381457131876.

The previous prime is 381457131859. The next prime is 381457131919. The reversal of 381457131877 is 778131754183.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 341039648196 + 40417483681 = 583986^2 + 201041^2 .

It is a cyclic number.

It is not a de Polignac number, because 381457131877 - 2¹¹ = 381457129829 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (381457131817) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 190728565938 + 190728565939.

It is an arithmetic number, because the mean of its divisors is an integer number (190728565939).

Almost surely, 2^381457131877 is an apocalyptic number.

It is an amenable number.

381457131877 is a deficient number, since it is larger than the sum of its proper divisors (1).

381457131877 is an equidigital number, since it uses as much as digits as its factorization.

381457131877 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3951360, while the sum is 55.

The spelling of 381457131877 in words is "three hundred eighty-one billion, four hundred fifty-seven million, one hundred thirty-one thousand, eight hundred seventy-seven".