61386621 has 8 divisors (see below), whose sum is σ = 81950880. Its totient is φ = 40873392.

The previous prime is 61386617. The next prime is 61386631. The reversal of 61386621 is 12668316.

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

It is not a de Polignac number, because 61386621 - 2² = 61386617 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61386631) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9855 + ... + 14828.

It is an arithmetic number, because the mean of its divisors is an integer number (10243860).

Almost surely, 2^61386621 is an apocalyptic number.

It is an amenable number.

61386621 is a deficient number, since it is larger than the sum of its proper divisors (20564259).

61386621 is a wasteful number, since it uses less digits than its factorization.

61386621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25515.

The product of its digits is 10368, while the sum is 33.

The square root of 61386621 is about 7834.9614549148. The cubic root of 61386621 is about 394.4796245346.

The spelling of 61386621 in words is "sixty-one million, three hundred eighty-six thousand, six hundred twenty-one".