387637455481 has 2 divisors, whose sum is σ = 387637455482. Its totient is φ = 387637455480.

The previous prime is 387637455473. The next prime is 387637455523. The reversal of 387637455481 is 184554736783.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 284264917225 + 103372538256 = 533165^2 + 321516^2 .

It is a cyclic number.

It is not a de Polignac number, because 387637455481 - 2³ = 387637455473 is a prime.

It is a super-2 number, since 2×387637455481² (a number of 24 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (387637455451) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 193818727740 + 193818727741.

It is an arithmetic number, because the mean of its divisors is an integer number (193818727741).

Almost surely, 2^387637455481 is an apocalyptic number.

It is an amenable number.

387637455481 is a deficient number, since it is larger than the sum of its proper divisors (1).

387637455481 is an equidigital number, since it uses as much as digits as its factorization.

387637455481 is an evil number, because the sum of its binary digits is even.

The product of its digits is 67737600, while the sum is 61.

The spelling of 387637455481 in words is "three hundred eighty-seven billion, six hundred thirty-seven million, four hundred fifty-five thousand, four hundred eighty-one".