387974670491 has 2 divisors, whose sum is σ = 387974670492. Its totient is φ = 387974670490.

The previous prime is 387974670467. The next prime is 387974670521. The reversal of 387974670491 is 194076479783.

It is a weak prime.

It is an emirp because it is prime and its reverse (194076479783) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 387974670491 - 2¹⁸ = 387974408347 is a prime.

It is not a weakly prime, because it can be changed into another prime (387974670401) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 193987335245 + 193987335246.

It is an arithmetic number, because the mean of its divisors is an integer number (193987335246).

Almost surely, 2^387974670491 is an apocalyptic number.

387974670491 is a deficient number, since it is larger than the sum of its proper divisors (1).

387974670491 is an equidigital number, since it uses as much as digits as its factorization.

387974670491 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 64012032, while the sum is 65.

The spelling of 387974670491 in words is "three hundred eighty-seven billion, nine hundred seventy-four million, six hundred seventy thousand, four hundred ninety-one".