54437981 has 4 divisors (see below), whose sum is σ = 58625532. Its totient is φ = 50250432.

The previous prime is 54437963. The next prime is 54438019. The reversal of 54437981 is 18973445.

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 2669956 + 51768025 = 1634^2 + 7195^2 .

It is a cyclic number.

It is not a de Polignac number, because 54437981 - 2⁶ = 54437917 is a prime.

It is a super-2 number, since 2×54437981² = 5926987550712722, 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 (54437921) 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, 2093756 + ... + 2093781.

It is an arithmetic number, because the mean of its divisors is an integer number (14656383).

Almost surely, 2^54437981 is an apocalyptic number.

It is an amenable number.

54437981 is a deficient number, since it is larger than the sum of its proper divisors (4187551).

54437981 is a wasteful number, since it uses less digits than its factorization.

54437981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4187550.

The product of its digits is 120960, while the sum is 41.

The square root of 54437981 is about 7378.2098777413. The cubic root of 54437981 is about 378.9954562103.

The spelling of 54437981 in words is "fifty-four million, four hundred thirty-seven thousand, nine hundred eighty-one".