54243661 has 4 divisors (see below), whose sum is σ = 54802972. Its totient is φ = 53684352.

The previous prime is 54243649. The next prime is 54243667. The reversal of 54243661 is 16634245.

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 39765636 + 14478025 = 6306^2 + 3805^2 .

It is a cyclic number.

It is not a de Polignac number, because 54243661 - 2¹³ = 54235469 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (54243667) 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, 279510 + ... + 279703.

It is an arithmetic number, because the mean of its divisors is an integer number (13700743).

Almost surely, 2^54243661 is an apocalyptic number.

It is an amenable number.

54243661 is a deficient number, since it is larger than the sum of its proper divisors (559311).

54243661 is an equidigital number, since it uses as much as digits as its factorization.

54243661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 559310.

The product of its digits is 17280, while the sum is 31.

The square root of 54243661 is about 7365.0295993974. The cubic root of 54243661 is about 378.5439687350.

The spelling of 54243661 in words is "fifty-four million, two hundred forty-three thousand, six hundred sixty-one".