61147861 has 4 divisors (see below), whose sum is σ = 64744812. Its totient is φ = 57550912.

The previous prime is 61147859. The next prime is 61147873. The reversal of 61147861 is 16874116.

61147861 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 51753636 + 9394225 = 7194^2 + 3065^2 .

It is a cyclic number.

It is not a de Polignac number, because 61147861 - 2¹ = 61147859 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 (61147811) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1798450 + ... + 1798483.

It is an arithmetic number, because the mean of its divisors is an integer number (16186203).

Almost surely, 2^61147861 is an apocalyptic number.

It is an amenable number.

61147861 is a deficient number, since it is larger than the sum of its proper divisors (3596951).

61147861 is a wasteful number, since it uses less digits than its factorization.

61147861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3596950.

The product of its digits is 8064, while the sum is 34.

The square root of 61147861 is about 7819.7097772232. The cubic root of 61147861 is about 393.9675241856.

The spelling of 61147861 in words is "sixty-one million, one hundred forty-seven thousand, eight hundred sixty-one".