61224481 has 4 divisors (see below), whose sum is σ = 63335700. Its totient is φ = 59113264.

The previous prime is 61224467. The next prime is 61224523. The reversal of 61224481 is 18442216.

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 11451456 + 49773025 = 3384^2 + 7055^2 .

It is a cyclic number.

It is not a de Polignac number, because 61224481 - 2⁷ = 61224353 is a prime.

It is a super-2 number, since 2×61224481² = 7496874147438722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (61224421) 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, 1055566 + ... + 1055623.

It is an arithmetic number, because the mean of its divisors is an integer number (15833925).

Almost surely, 2^61224481 is an apocalyptic number.

It is an amenable number.

61224481 is a deficient number, since it is larger than the sum of its proper divisors (2111219).

61224481 is a wasteful number, since it uses less digits than its factorization.

61224481 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2111218.

The product of its digits is 3072, while the sum is 28.

The square root of 61224481 is about 7824.6074022918. The cubic root of 61224481 is about 394.1320063228.

Adding to 61224481 its reverse (18442216), we get a palindrome (79666697).

The spelling of 61224481 in words is "sixty-one million, two hundred twenty-four thousand, four hundred eighty-one".