91948139 has 4 divisors (see below), whose sum is σ = 94914240. Its totient is φ = 88982040.

The previous prime is 91948133. The next prime is 91948151. The reversal of 91948139 is 93184919.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 93184919 = 3943 ⋅23633.

It is a cyclic number.

It is not a de Polignac number, because 91948139 - 2⁴ = 91948123 is a prime.

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 91948139.

It is not an unprimeable number, because it can be changed into a prime (91948133) 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, 1483004 + ... + 1483065.

It is an arithmetic number, because the mean of its divisors is an integer number (23728560).

Almost surely, 2^91948139 is an apocalyptic number.

91948139 is a deficient number, since it is larger than the sum of its proper divisors (2966101).

91948139 is a wasteful number, since it uses less digits than its factorization.

91948139 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2966100.

The product of its digits is 69984, while the sum is 44.

The square root of 91948139 is about 9588.9592240243. The cubic root of 91948139 is about 451.3509018459.

The spelling of 91948139 in words is "ninety-one million, nine hundred forty-eight thousand, one hundred thirty-nine".