56280994981 has 4 divisors (see below), whose sum is σ = 56827412512. Its totient is φ = 55734577452.

The previous prime is 56280994967. The next prime is 56280995011. The reversal of 56280994981 is 18949908265.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-56280994981 is a prime.

It is a super-2 number, since 2×56280994981² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (56280994901) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 273208611 + ... + 273208816.

It is an arithmetic number, because the mean of its divisors is an integer number (14206853128).

Almost surely, 2^56280994981 is an apocalyptic number.

It is an amenable number.

56280994981 is a deficient number, since it is larger than the sum of its proper divisors (546417531).

56280994981 is a wasteful number, since it uses less digits than its factorization.

56280994981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 546417530.

The product of its (nonzero) digits is 11197440, while the sum is 61.

The spelling of 56280994981 in words is "fifty-six billion, two hundred eighty million, nine hundred ninety-four thousand, nine hundred eighty-one".