61717651 has 4 divisors (see below), whose sum is σ = 61825192. Its totient is φ = 61610112.

The previous prime is 61717613. The next prime is 61717697. The reversal of 61717651 is 15671716.

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 61717651 - 2¹¹ = 61715603 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (61717151) 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, 52905 + ... + 54058.

It is an arithmetic number, because the mean of its divisors is an integer number (15456298).

Almost surely, 2^61717651 is an apocalyptic number.

61717651 is a deficient number, since it is larger than the sum of its proper divisors (107541).

61717651 is a wasteful number, since it uses less digits than its factorization.

61717651 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 107540.

The product of its digits is 8820, while the sum is 34.

The square root of 61717651 is about 7856.0582355275. The cubic root of 61717651 is about 395.1874365464.

The spelling of 61717651 in words is "sixty-one million, seven hundred seventeen thousand, six hundred fifty-one".