61518621 has 8 divisors (see below), whose sum is σ = 82094080. Its totient is φ = 40977792.

The previous prime is 61518607. The next prime is 61518623. The reversal of 61518621 is 12681516.

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

It is not a de Polignac number, because 61518621 - 2⁹ = 61518109 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61518623) 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, 4180 + ... + 11853.

It is an arithmetic number, because the mean of its divisors is an integer number (10261760).

Almost surely, 2^61518621 is an apocalyptic number.

It is an amenable number.

61518621 is a deficient number, since it is larger than the sum of its proper divisors (20575459).

61518621 is a wasteful number, since it uses less digits than its factorization.

61518621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17315.

The product of its digits is 2880, while the sum is 30.

The square root of 61518621 is about 7843.3807124224. The cubic root of 61518621 is about 394.7621727024.

The spelling of 61518621 in words is "sixty-one million, five hundred eighteen thousand, six hundred twenty-one".