281581053861 has 16 divisors (see below), whose sum is σ = 385970772800. Its totient is φ = 182466079488.

The previous prime is 281581053857. The next prime is 281581053883. The reversal of 281581053861 is 168350185182.

It is not a de Polignac number, because 281581053861 - 2² = 281581053857 is a prime.

It is a Smith number, since the sum of its digits (48) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

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 281581053861.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (281581053161) 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, 1145071 + ... + 1369068.

It is an arithmetic number, because the mean of its divisors is an integer number (24123173300).

Almost surely, 2^281581053861 is an apocalyptic number.

It is an amenable number.

281581053861 is a deficient number, since it is larger than the sum of its proper divisors (104389718939).

281581053861 is a wasteful number, since it uses less digits than its factorization.

281581053861 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2515188.

The product of its (nonzero) digits is 460800, while the sum is 48.

The spelling of 281581053861 in words is "two hundred eighty-one billion, five hundred eighty-one million, fifty-three thousand, eight hundred sixty-one".