91719649 has 4 divisors (see below), whose sum is σ = 104822464. Its totient is φ = 78616836.

The previous prime is 91719623. The next prime is 91719659. The reversal of 91719649 is 94691719.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 94691719 = 43 ⋅2202133.

It is a cyclic number.

It is not a de Polignac number, because 91719649 - 2¹³ = 91711457 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 91719599 and 91719608.

It is not an unprimeable number, because it can be changed into a prime (91719619) 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, 6551397 + ... + 6551410.

It is an arithmetic number, because the mean of its divisors is an integer number (26205616).

Almost surely, 2^91719649 is an apocalyptic number.

It is an amenable number.

91719649 is a deficient number, since it is larger than the sum of its proper divisors (13102815).

91719649 is a wasteful number, since it uses less digits than its factorization.

91719649 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13102814.

The product of its digits is 122472, while the sum is 46.

The square root of 91719649 is about 9577.0375899857. The cubic root of 91719649 is about 450.9767245770.

The spelling of 91719649 in words is "ninety-one million, seven hundred nineteen thousand, six hundred forty-nine".