61530223 has 4 divisors (see below), whose sum is σ = 63193240. Its totient is φ = 59867208.

The previous prime is 61530197. The next prime is 61530241. The reversal of 61530223 is 32203516.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-61530223 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 61530194 and 61530203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61530263) 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, 831453 + ... + 831526.

It is an arithmetic number, because the mean of its divisors is an integer number (15798310).

Almost surely, 2^61530223 is an apocalyptic number.

61530223 is a deficient number, since it is larger than the sum of its proper divisors (1663017).

61530223 is a wasteful number, since it uses less digits than its factorization.

61530223 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1663016.

The product of its (nonzero) digits is 1080, while the sum is 22.

The square root of 61530223 is about 7844.1202820966. The cubic root of 61530223 is about 394.7869876434.

Adding to 61530223 its reverse (32203516), we get a palindrome (93733739).

The spelling of 61530223 in words is "sixty-one million, five hundred thirty thousand, two hundred twenty-three".