91612145209 has 8 divisors (see below), whose sum is σ = 99617091392. Its totient is φ = 83744035920.

The previous prime is 91612145203. The next prime is 91612145249. The reversal of 91612145209 is 90254121619.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 91612145209 - 2³ = 91612145201 is a prime.

It is not an unprimeable number, because it can be changed into a prime (91612145201) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 34207827 + ... + 34210504.

It is an arithmetic number, because the mean of its divisors is an integer number (12452136424).

Almost surely, 2^91612145209 is an apocalyptic number.

It is an amenable number.

91612145209 is a deficient number, since it is larger than the sum of its proper divisors (8004946183).

91612145209 is a wasteful number, since it uses less digits than its factorization.

91612145209 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 68418447.

The product of its (nonzero) digits is 38880, while the sum is 40.

The spelling of 91612145209 in words is "ninety-one billion, six hundred twelve million, one hundred forty-five thousand, two hundred nine".