54547851981 has 48 divisors (see below), whose sum is σ = 86463801600. Its totient is φ = 30492588672.

The previous prime is 54547851979. The next prime is 54547851989. The reversal of 54547851981 is 18915874545.

It is a happy number.

It is not a de Polignac number, because 54547851981 - 2¹ = 54547851979 is a prime.

It is a super-2 number, since 2×54547851981² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (54547851989) 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 47 ways as a sum of consecutive naturals, for example, 1244271 + ... + 1287363.

It is an arithmetic number, because the mean of its divisors is an integer number (1801329200).

Almost surely, 2^54547851981 is an apocalyptic number.

It is an amenable number.

54547851981 is a deficient number, since it is larger than the sum of its proper divisors (31915949619).

54547851981 is a wasteful number, since it uses less digits than its factorization.

54547851981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43298 (or 43291 counting only the distinct ones).

The product of its digits is 8064000, while the sum is 57.

The spelling of 54547851981 in words is "fifty-four billion, five hundred forty-seven million, eight hundred fifty-one thousand, nine hundred eighty-one".