61680191 has 2 divisors, whose sum is σ = 61680192. Its totient is φ = 61680190.

The previous prime is 61680167. The next prime is 61680253. The reversal of 61680191 is 19108616.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 61680191 - 2¹⁸ = 61418047 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (61680161) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30840095 + 30840096.

It is an arithmetic number, because the mean of its divisors is an integer number (30840096).

Almost surely, 2^61680191 is an apocalyptic number.

61680191 is a deficient number, since it is larger than the sum of its proper divisors (1).

61680191 is an equidigital number, since it uses as much as digits as its factorization.

61680191 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2592, while the sum is 32.

The square root of 61680191 is about 7853.6737263525. The cubic root of 61680191 is about 395.1074663530.

The spelling of 61680191 in words is "sixty-one million, six hundred eighty thousand, one hundred ninety-one".