391000020281 has 16 divisors (see below), whose sum is σ = 445974480000. Its totient is φ = 339594571008.

The previous prime is 391000020277. The next prime is 391000020283. The reversal of 391000020281 is 182020000193.

It is a cyclic number.

It is not a de Polignac number, because 391000020281 - 2² = 391000020277 is a prime.

It is a super-2 number, since 2×391000020281² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 391000020281.

It is not an unprimeable number, because it can be changed into a prime (391000020283) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 520460 + ... + 1026098.

It is an arithmetic number, because the mean of its divisors is an integer number (27873405000).

Almost surely, 2^391000020281 is an apocalyptic number.

It is an amenable number.

391000020281 is a deficient number, since it is larger than the sum of its proper divisors (54974459719).

391000020281 is a wasteful number, since it uses less digits than its factorization.

391000020281 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 509168.

The product of its (nonzero) digits is 864, while the sum is 26.

The spelling of 391000020281 in words is "three hundred ninety-one billion, twenty thousand, two hundred eighty-one".