61424581 has 4 divisors (see below), whose sum is σ = 63542700. Its totient is φ = 59306464.

The previous prime is 61424579. The next prime is 61424617. The reversal of 61424581 is 18542416.

61424581 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 18404100 + 43020481 = 4290^2 + 6559^2 .

It is a cyclic number.

It is not a de Polignac number, because 61424581 - 2¹ = 61424579 is a prime.

It is a super-2 number, since 2×61424581² = 7545958302051122, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61424501) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1059016 + ... + 1059073.

It is an arithmetic number, because the mean of its divisors is an integer number (15885675).

Almost surely, 2^61424581 is an apocalyptic number.

It is an amenable number.

61424581 is a deficient number, since it is larger than the sum of its proper divisors (2118119).

61424581 is a wasteful number, since it uses less digits than its factorization.

61424581 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2118118.

The product of its digits is 7680, while the sum is 31.

The square root of 61424581 is about 7837.3835557538. The cubic root of 61424581 is about 394.5609199958.

Adding to 61424581 its reverse (18542416), we get a palindrome (79966997).

The spelling of 61424581 in words is "sixty-one million, four hundred twenty-four thousand, five hundred eighty-one".