391380628081 has 24 divisors (see below), whose sum is σ = 433402460352. Its totient is φ = 352495519200.

The previous prime is 391380628073. The next prime is 391380628087. The reversal of 391380628081 is 180826083193.

It is not a de Polignac number, because 391380628081 - 2³ = 391380628073 is a prime.

It is a super-2 number, since 2×391380628081² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (391380628087) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 578526 + ... + 1057096.

It is an arithmetic number, because the mean of its divisors is an integer number (18058435848).

Almost surely, 2^391380628081 is an apocalyptic number.

391380628081 is a gapful number since it is divisible by the number (31) formed by its first and last digit.

It is an amenable number.

391380628081 is a deficient number, since it is larger than the sum of its proper divisors (42021832271).

391380628081 is a wasteful number, since it uses less digits than its factorization.

391380628081 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 478693 (or 478662 counting only the distinct ones).

The product of its (nonzero) digits is 497664, while the sum is 49.

The spelling of 391380628081 in words is "three hundred ninety-one billion, three hundred eighty million, six hundred twenty-eight thousand, eighty-one".