387806353081 has 45 divisors (see below), whose sum is σ = 461453470373. Its totient is φ = 325892820120.

The previous prime is 387806353049. The next prime is 387806353087. The reversal of 387806353081 is 180353608783.

The square root of 387806353081 is 622741.

It is a perfect power (a square), and thus also a powerful number.

It is not a de Polignac number, because 387806353081 - 2⁵ = 387806353049 is a prime.

It is a super-2 number, since 2×387806353081² (a number of 24 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (387806353087) by changing a digit.

It is a polite number, since it can be written in 44 ways as a sum of consecutive naturals, for example, 2166515850 + ... + 2166516028.

Almost surely, 2^387806353081 is an apocalyptic number.

387806353081 is the 622741-st square number.

387806353081 is the 311371-st centered octagonal number.

It is an amenable number.

387806353081 is a deficient number, since it is larger than the sum of its proper divisors (73647117292).

387806353081 is an frugal number, since it uses more digits than its factorization.

387806353081 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 528 (or 257 counting only the distinct ones).

The product of its (nonzero) digits is 2903040, while the sum is 52.

The spelling of 387806353081 in words is "three hundred eighty-seven billion, eight hundred six million, three hundred fifty-three thousand, eighty-one".