54389981 has 4 divisors (see below), whose sum is σ = 54736572. Its totient is φ = 54043392.

The previous prime is 54389939. The next prime is 54390001. The reversal of 54389981 is 18998345.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 7344100 + 47045881 = 2710^2 + 6859^2 .

It is a cyclic number.

It is not a de Polignac number, because 54389981 - 2¹⁸ = 54127837 is a prime.

It is a super-2 number, since 2×54389981² = 5916540066360722, which 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 (54389921) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 173060 + ... + 173373.

It is an arithmetic number, because the mean of its divisors is an integer number (13684143).

Almost surely, 2^54389981 is an apocalyptic number.

It is an amenable number.

54389981 is a deficient number, since it is larger than the sum of its proper divisors (346591).

54389981 is a wasteful number, since it uses less digits than its factorization.

54389981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 346590.

The product of its digits is 311040, while the sum is 47.

The square root of 54389981 is about 7374.9563388538. The cubic root of 54389981 is about 378.8840319744.

The spelling of 54389981 in words is "fifty-four million, three hundred eighty-nine thousand, nine hundred eighty-one".