61424521 has 4 divisors (see below), whose sum is σ = 61589572. Its totient is φ = 61259472.

The previous prime is 61424501. The next prime is 61424533. The reversal of 61424521 is 12542416.

It is a happy number.

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 44408896 + 17015625 = 6664^2 + 4125^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-61424521 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (61424501) 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, 81966 + ... + 82711.

It is an arithmetic number, because the mean of its divisors is an integer number (15397393).

Almost surely, 2^61424521 is an apocalyptic number.

It is an amenable number.

61424521 is a deficient number, since it is larger than the sum of its proper divisors (165051).

61424521 is a wasteful number, since it uses less digits than its factorization.

61424521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 165050.

The product of its digits is 1920, while the sum is 25.

The square root of 61424521 is about 7837.3797279448. The cubic root of 61424521 is about 394.5607915257.

Adding to 61424521 its reverse (12542416), we get a palindrome (73966937).

The spelling of 61424521 in words is "sixty-one million, four hundred twenty-four thousand, five hundred twenty-one".