91948919 has 4 divisors (see below), whose sum is σ = 92896944. Its totient is φ = 91000896.

The previous prime is 91948907. The next prime is 91948931. The reversal of 91948919 is 91984919.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 91984919 = 13 ⋅7075763.

It is an interprime number because it is at equal distance from previous prime (91948907) and next prime (91948931).

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-91948919 is a prime.

It is a super-2 number, since 2×91948919² = 16909207410537122, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91948949) 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 3 ways as a sum of consecutive naturals, for example, 473867 + ... + 474060.

It is an arithmetic number, because the mean of its divisors is an integer number (23224236).

Almost surely, 2^91948919 is an apocalyptic number.

91948919 is a deficient number, since it is larger than the sum of its proper divisors (948025).

91948919 is an equidigital number, since it uses as much as digits as its factorization.

91948919 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 948024.

The product of its digits is 209952, while the sum is 50.

The square root of 91948919 is about 9588.9998957138. Note that the first 3 decimals coincide. The cubic root of 91948919 is about 451.3521781186.

The spelling of 91948919 in words is "ninety-one million, nine hundred forty-eight thousand, nine hundred nineteen".