60991187 has 4 divisors (see below), whose sum is σ = 61010760. Its totient is φ = 60971616.

The previous prime is 60991163. The next prime is 60991199. The reversal of 60991187 is 78119906.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 60991187 - 2⁶ = 60991123 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (60991487) 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, 3953 + ... + 11730.

It is an arithmetic number, because the mean of its divisors is an integer number (15252690).

Almost surely, 2^60991187 is an apocalyptic number.

60991187 is a deficient number, since it is larger than the sum of its proper divisors (19573).

60991187 is a wasteful number, since it uses less digits than its factorization.

60991187 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19572.

The product of its (nonzero) digits is 27216, while the sum is 41.

The square root of 60991187 is about 7809.6854610157. The cubic root of 60991187 is about 393.6307598290.

The spelling of 60991187 in words is "sixty million, nine hundred ninety-one thousand, one hundred eighty-seven".