61861617 has 16 divisors (see below), whose sum is σ = 91769280. Its totient is φ = 41186016.

The previous prime is 61861609. The next prime is 61861619. The reversal of 61861617 is 71616816.

It is not a de Polignac number, because 61861617 - 2³ = 61861609 is a prime.

It is a Smith number, since the sum of its digits (36) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (61861619) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 34413 + ... + 36165.

It is an arithmetic number, because the mean of its divisors is an integer number (5735580).

Almost surely, 2^61861617 is an apocalyptic number.

It is an amenable number.

61861617 is a deficient number, since it is larger than the sum of its proper divisors (29907663).

61861617 is a wasteful number, since it uses less digits than its factorization.

61861617 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3069 (or 3063 counting only the distinct ones).

The product of its digits is 12096, while the sum is 36.

The square root of 61861617 is about 7865.2156359505. The cubic root of 61861617 is about 395.4944766077.

The spelling of 61861617 in words is "sixty-one million, eight hundred sixty-one thousand, six hundred seventeen".