61304521 has 4 divisors (see below), whose sum is σ = 63418500. Its totient is φ = 59190544.

The previous prime is 61304501. The next prime is 61304527. The reversal of 61304521 is 12540316.

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 49505296 + 11799225 = 7036^2 + 3435^2 .

It is a cyclic number.

It is not a de Polignac number, because 61304521 - 2⁵ = 61304489 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 61304492 and 61304501.

It is not an unprimeable number, because it can be changed into a prime (61304527) 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, 1056946 + ... + 1057003.

It is an arithmetic number, because the mean of its divisors is an integer number (15854625).

Almost surely, 2^61304521 is an apocalyptic number.

It is an amenable number.

61304521 is a deficient number, since it is larger than the sum of its proper divisors (2113979).

61304521 is a wasteful number, since it uses less digits than its factorization.

61304521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2113978.

The product of its (nonzero) digits is 720, while the sum is 22.

The square root of 61304521 is about 7829.7203653770. The cubic root of 61304521 is about 394.3036837749.

Adding to 61304521 its reverse (12540316), we get a palindrome (73844837).

The spelling of 61304521 in words is "sixty-one million, three hundred four thousand, five hundred twenty-one".