61006521 has 8 divisors (see below), whose sum is σ = 81444160. Its totient is φ = 40619952.

The previous prime is 61006487. The next prime is 61006529. The reversal of 61006521 is 12560016.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 61006521 - 2⁶ = 61006457 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (61006529) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9886 + ... + 14823.

It is an arithmetic number, because the mean of its divisors is an integer number (10180520).

Almost surely, 2^61006521 is an apocalyptic number.

It is an amenable number.

61006521 is a deficient number, since it is larger than the sum of its proper divisors (20437639).

61006521 is a wasteful number, since it uses less digits than its factorization.

61006521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25535.

The product of its (nonzero) digits is 360, while the sum is 21.

The square root of 61006521 is about 7810.6671289974. The cubic root of 61006521 is about 393.6637450771.

Adding to 61006521 its reverse (12560016), we get a palindrome (73566537).

It can be divided in two parts, 6100 and 6521, that added together give a palindrome (12621).

The spelling of 61006521 in words is "sixty-one million, six thousand, five hundred twenty-one".