55721041 has 4 divisors (see below), whose sum is σ = 55735972. Its totient is φ = 55706112.

The previous prime is 55721033. The next prime is 55721047. The reversal of 55721041 is 14012755.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 14012755 = 5 ⋅2802551.

It can be written as a sum of positive squares in 2 ways, for example, as 15968016 + 39753025 = 3996^2 + 6305^2 .

It is a cyclic number.

It is not a de Polignac number, because 55721041 - 2³ = 55721033 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 55720997 and 55721015.

It is not an unprimeable number, because it can be changed into a prime (55721047) 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, 3625 + ... + 11161.

It is an arithmetic number, because the mean of its divisors is an integer number (13933993).

Almost surely, 2^55721041 is an apocalyptic number.

It is an amenable number.

55721041 is a deficient number, since it is larger than the sum of its proper divisors (14931).

55721041 is an equidigital number, since it uses as much as digits as its factorization.

55721041 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14930.

The product of its (nonzero) digits is 1400, while the sum is 25.

The square root of 55721041 is about 7464.6527715628. The cubic root of 55721041 is about 381.9499057142.

Adding to 55721041 its reverse (14012755), we get a palindrome (69733796).

The spelling of 55721041 in words is "fifty-five million, seven hundred twenty-one thousand, forty-one".