91619 has 4 divisors (see below), whose sum is σ = 99960. Its totient is φ = 83280.

The previous prime is 91591. The next prime is 91621.

91619 is nontrivially palindromic in base 10.

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 91619 - 2¹² = 87523 is a prime.

It is a super-2 number, since 2×91619² = 16788082322, which contains 22 as substring.

It is a Duffinian number.

It is a zygodrome in base 3.

It is not an unprimeable number, because it can be changed into a prime (91639) 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, 4154 + ... + 4175.

It is an arithmetic number, because the mean of its divisors is an integer number (24990).

2⁹¹⁶¹⁹ is an apocalyptic number.

91619 is a deficient number, since it is larger than the sum of its proper divisors (8341).

91619 is a wasteful number, since it uses less digits than its factorization.

91619 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8340.

The product of its digits is 486, while the sum is 26.

The square root of 91619 is about 302.6863062644. The cubic root of 91619 is about 45.0811703704.

The spelling of 91619 in words is "ninety-one thousand, six hundred nineteen".