381559877 has 2 divisors, whose sum is σ = 381559878. Its totient is φ = 381559876.

The previous prime is 381559853. The next prime is 381559889. The reversal of 381559877 is 778955183.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 380991361 + 568516 = 19519^2 + 754^2 .

It is an emirp because it is prime and its reverse (778955183) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 381559877 - 2⁶ = 381559813 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (381559837) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 190779938 + 190779939.

It is an arithmetic number, because the mean of its divisors is an integer number (190779939).

Almost surely, 2^381559877 is an apocalyptic number.

It is an amenable number.

381559877 is a deficient number, since it is larger than the sum of its proper divisors (1).

381559877 is an equidigital number, since it uses as much as digits as its factorization.

381559877 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2116800, while the sum is 53.

The square root of 381559877 is about 19533.5577148660. The cubic root of 381559877 is about 725.3053819327.

The spelling of 381559877 in words is "three hundred eighty-one million, five hundred fifty-nine thousand, eight hundred seventy-seven".