61518571 has 4 divisors (see below), whose sum is σ = 61558144. Its totient is φ = 61479000.

The previous prime is 61518559. The next prime is 61518577. The reversal of 61518571 is 17581516.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 61518571 - 2⁹ = 61518059 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (61518577) 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, 17355 + ... + 20596.

It is an arithmetic number, because the mean of its divisors is an integer number (15389536).

Almost surely, 2^61518571 is an apocalyptic number.

61518571 is a deficient number, since it is larger than the sum of its proper divisors (39573).

61518571 is a wasteful number, since it uses less digits than its factorization.

61518571 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39572.

The product of its digits is 8400, while the sum is 34.

The square root of 61518571 is about 7843.3775250207. The cubic root of 61518571 is about 394.7620657532.

The spelling of 61518571 in words is "sixty-one million, five hundred eighteen thousand, five hundred seventy-one".