61866041 has 4 divisors (see below), whose sum is σ = 61884900. Its totient is φ = 61847184.

The previous prime is 61866029. The next prime is 61866061. The reversal of 61866041 is 14066816.

It is a happy number.

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 42250000 + 19616041 = 6500^2 + 4429^2 .

It is a cyclic number.

It is not a de Polignac number, because 61866041 - 2¹⁰ = 61865017 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 61865989 and 61866007.

It is not an unprimeable number, because it can be changed into a prime (61866061) 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, 3086 + ... + 11543.

It is an arithmetic number, because the mean of its divisors is an integer number (15471225).

Almost surely, 2^61866041 is an apocalyptic number.

It is an amenable number.

61866041 is a deficient number, since it is larger than the sum of its proper divisors (18859).

61866041 is a wasteful number, since it uses less digits than its factorization.

61866041 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18858.

The product of its (nonzero) digits is 6912, while the sum is 32.

The square root of 61866041 is about 7865.4968692385. The cubic root of 61866041 is about 395.5039042407.

The spelling of 61866041 in words is "sixty-one million, eight hundred sixty-six thousand, forty-one".