61847861 has 4 divisors (see below), whose sum is σ = 62045772. Its totient is φ = 61649952.

The previous prime is 61847843. The next prime is 61847867. The reversal of 61847861 is 16874816.

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

It can be written as a sum of positive squares in 2 ways, for example, as 9647236 + 52200625 = 3106^2 + 7225^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-61847861 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 (61847867) 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 3 ways as a sum of consecutive naturals, for example, 98486 + ... + 99111.

It is an arithmetic number, because the mean of its divisors is an integer number (15511443).

Almost surely, 2^61847861 is an apocalyptic number.

It is an amenable number.

61847861 is a deficient number, since it is larger than the sum of its proper divisors (197911).

61847861 is a wasteful number, since it uses less digits than its factorization.

61847861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 197910.

The product of its digits is 64512, while the sum is 41.

The square root of 61847861 is about 7864.3411039959. The cubic root of 61847861 is about 395.4651594232.

The spelling of 61847861 in words is "sixty-one million, eight hundred forty-seven thousand, eight hundred sixty-one".