387135405991 has 2 divisors, whose sum is σ = 387135405992. Its totient is φ = 387135405990.

The previous prime is 387135405871. The next prime is 387135406037. The reversal of 387135405991 is 199504531783.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 387135405991 - 2¹¹ = 387135403943 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (387135405091) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 193567702995 + 193567702996.

It is an arithmetic number, because the mean of its divisors is an integer number (193567702996).

Almost surely, 2^387135405991 is an apocalyptic number.

387135405991 is a deficient number, since it is larger than the sum of its proper divisors (1).

387135405991 is an equidigital number, since it uses as much as digits as its factorization.

387135405991 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4082400, while the sum is 55.

The spelling of 387135405991 in words is "three hundred eighty-seven billion, one hundred thirty-five million, four hundred five thousand, nine hundred ninety-one".