61800959 has 4 divisors (see below), whose sum is σ = 67419240. Its totient is φ = 56182680.

The previous prime is 61800941. The next prime is 61800971. The reversal of 61800959 is 95900816.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-61800959 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 (61800919) 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, 2809124 + ... + 2809145.

It is an arithmetic number, because the mean of its divisors is an integer number (16854810).

Almost surely, 2^61800959 is an apocalyptic number.

61800959 is a deficient number, since it is larger than the sum of its proper divisors (5618281).

61800959 is a wasteful number, since it uses less digits than its factorization.

61800959 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5618280.

The product of its (nonzero) digits is 19440, while the sum is 38.

The square root of 61800959 is about 7861.3585975962. The cubic root of 61800959 is about 395.3651678352.

The spelling of 61800959 in words is "sixty-one million, eight hundred thousand, nine hundred fifty-nine".