61000191 has 24 divisors (see below), whose sum is σ = 102604320. Its totient is φ = 34197696.

The previous prime is 61000189. The next prime is 61000193. The reversal of 61000191 is 19100016.

It is an interprime number because it is at equal distance from previous prime (61000189) and next prime (61000193).

It is not a de Polignac number, because 61000191 - 2¹ = 61000189 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61000193) 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 23 ways as a sum of consecutive naturals, for example, 5796 + ... + 12473.

It is an arithmetic number, because the mean of its divisors is an integer number (4275180).

Almost surely, 2^61000191 is an apocalyptic number.

61000191 is a deficient number, since it is larger than the sum of its proper divisors (41604129).

61000191 is a wasteful number, since it uses less digits than its factorization.

61000191 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18335 (or 18332 counting only the distinct ones).

The product of its (nonzero) digits is 54, while the sum is 18.

The square root of 61000191 is about 7810.2619034191. The cubic root of 61000191 is about 393.6501291682.

The spelling of 61000191 in words is "sixty-one million, one hundred ninety-one", and thus it is an aban number.