55722013 has 4 divisors (see below), whose sum is σ = 55796380. Its totient is φ = 55647648.

The previous prime is 55721959. The next prime is 55722047. The reversal of 55722013 is 31022755.

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 13380964 + 42341049 = 3658^2 + 6507^2 .

It is a cyclic number.

It is not a de Polignac number, because 55722013 - 2¹³ = 55713821 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 (55722083) 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, 36048 + ... + 37561.

It is an arithmetic number, because the mean of its divisors is an integer number (13949095).

Almost surely, 2^55722013 is an apocalyptic number.

It is an amenable number.

55722013 is a deficient number, since it is larger than the sum of its proper divisors (74367).

55722013 is an equidigital number, since it uses as much as digits as its factorization.

55722013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 74366.

The product of its (nonzero) digits is 2100, while the sum is 25.

The square root of 55722013 is about 7464.7178781251. The cubic root of 55722013 is about 381.9521266176.

Adding to 55722013 its reverse (31022755), we get a palindrome (86744768).

The spelling of 55722013 in words is "fifty-five million, seven hundred twenty-two thousand, thirteen".