387949317761 has 2 divisors, whose sum is σ = 387949317762. Its totient is φ = 387949317760.

The previous prime is 387949317733. The next prime is 387949317773. The reversal of 387949317761 is 167713949783.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 194145984400 + 193803333361 = 440620^2 + 440231^2 .

It is a cyclic number.

It is not a de Polignac number, because 387949317761 - 2²⁶ = 387882208897 is a prime.

It is not a weakly prime, because it can be changed into another prime (387949317781) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 193974658880 + 193974658881.

It is an arithmetic number, because the mean of its divisors is an integer number (193974658881).

Almost surely, 2^387949317761 is an apocalyptic number.

It is an amenable number.

387949317761 is a deficient number, since it is larger than the sum of its proper divisors (1).

387949317761 is an equidigital number, since it uses as much as digits as its factorization.

387949317761 is an evil number, because the sum of its binary digits is even.

The product of its digits is 48009024, while the sum is 65.

The spelling of 387949317761 in words is "three hundred eighty-seven billion, nine hundred forty-nine million, three hundred seventeen thousand, seven hundred sixty-one".