64612191 has 16 divisors (see below), whose sum is σ = 98599424. Its totient is φ = 36867744.

The previous prime is 64612183. The next prime is 64612199. The reversal of 64612191 is 19121646.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (64612183) and next prime (64612199).

It is not a de Polignac number, because 64612191 - 2³ = 64612183 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64612199) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 16110 + ... + 19716.

It is an arithmetic number, because the mean of its divisors is an integer number (6162464).

Almost surely, 2^64612191 is an apocalyptic number.

64612191 is a deficient number, since it is larger than the sum of its proper divisors (33987233).

64612191 is a wasteful number, since it uses less digits than its factorization.

64612191 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4470.

The product of its digits is 2592, while the sum is 30.

The square root of 64612191 is about 8038.1708740235. The cubic root of 64612191 is about 401.2713527908.

The spelling of 64612191 in words is "sixty-four million, six hundred twelve thousand, one hundred ninety-one".