91945619 has 8 divisors (see below), whose sum is σ = 93951792. Its totient is φ = 89949600.

The previous prime is 91945603. The next prime is 91945643. The reversal of 91945619 is 91654919.

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 91945619 - 2⁴ = 91945603 is a prime.

It is a super-2 number, since 2×91945619² = 16907993706586322, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 91945619.

It is not an unprimeable number, because it can be changed into a prime (91945649) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 17444 + ... + 22094.

It is an arithmetic number, because the mean of its divisors is an integer number (11743974).

Almost surely, 2^91945619 is an apocalyptic number.

91945619 is a deficient number, since it is larger than the sum of its proper divisors (2006173).

91945619 is a wasteful number, since it uses less digits than its factorization.

91945619 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5077.

The product of its digits is 87480, while the sum is 44.

The square root of 91945619 is about 9588.8278220020. The cubic root of 91945619 is about 451.3467784539.

The spelling of 91945619 in words is "ninety-one million, nine hundred forty-five thousand, six hundred nineteen".