387135405781 has 2 divisors, whose sum is σ = 387135405782. Its totient is φ = 387135405780.

The previous prime is 387135405743. The next prime is 387135405809. The reversal of 387135405781 is 187504531783.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 354898998756 + 32236407025 = 595734^2 + 179545^2 .

It is a cyclic number.

It is not a de Polignac number, because 387135405781 - 2¹³ = 387135397589 is a prime.

It is a super-2 number, since 2×387135405781² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (387135105781) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 193567702890 + 193567702891.

It is an arithmetic number, because the mean of its divisors is an integer number (193567702891).

Almost surely, 2^387135405781 is an apocalyptic number.

It is an amenable number.

387135405781 is a deficient number, since it is larger than the sum of its proper divisors (1).

387135405781 is an equidigital number, since it uses as much as digits as its factorization.

387135405781 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2822400, while the sum is 52.

The spelling of 387135405781 in words is "three hundred eighty-seven billion, one hundred thirty-five million, four hundred five thousand, seven hundred eighty-one".