55523213 has 4 divisors (see below), whose sum is σ = 55613820. Its totient is φ = 55432608.

The previous prime is 55523203. The next prime is 55523227. The reversal of 55523213 is 31232555.

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 5368489 + 50154724 = 2317^2 + 7082^2 .

It is a cyclic number.

It is not a de Polignac number, because 55523213 - 2¹⁰ = 55522189 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55523203) 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, 44378 + ... + 45611.

It is an arithmetic number, because the mean of its divisors is an integer number (13903455).

Almost surely, 2^55523213 is an apocalyptic number.

It is an amenable number.

55523213 is a deficient number, since it is larger than the sum of its proper divisors (90607).

55523213 is an equidigital number, since it uses as much as digits as its factorization.

55523213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 90606.

The product of its digits is 4500, while the sum is 26.

The square root of 55523213 is about 7451.3900045562. The cubic root of 55523213 is about 381.4973538428.

Adding to 55523213 its reverse (31232555), we get a palindrome (86755768).

The spelling of 55523213 in words is "fifty-five million, five hundred twenty-three thousand, two hundred thirteen".