61980191 has 32 divisors (see below), whose sum is σ = 79822848. Its totient is φ = 46811520.

The previous prime is 61980179. The next prime is 61980211. The reversal of 61980191 is 19108916.

It is not a de Polignac number, because 61980191 - 2²² = 57785887 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61980131) 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 31 ways as a sum of consecutive naturals, for example, 358181 + ... + 358353.

It is an arithmetic number, because the mean of its divisors is an integer number (2494464).

Almost surely, 2^61980191 is an apocalyptic number.

61980191 is a deficient number, since it is larger than the sum of its proper divisors (17842657).

61980191 is a wasteful number, since it uses less digits than its factorization.

61980191 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 351.

The product of its (nonzero) digits is 3888, while the sum is 35.

The square root of 61980191 is about 7872.7499007653. The cubic root of 61980191 is about 395.7470049325.

The spelling of 61980191 in words is "sixty-one million, nine hundred eighty thousand, one hundred ninety-one".