88191921 has 8 divisors (see below), whose sum is σ = 117816160. Its totient is φ = 58681152.

The previous prime is 88191911. The next prime is 88191941. The reversal of 88191921 is 12919188.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 88191921 - 2¹¹ = 88189873 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 88191921.

It is not an unprimeable number, because it can be changed into a prime (88191911) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 26536 + ... + 29673.

It is an arithmetic number, because the mean of its divisors is an integer number (14727020).

Almost surely, 2^88191921 is an apocalyptic number.

It is an amenable number.

88191921 is a deficient number, since it is larger than the sum of its proper divisors (29624239).

88191921 is a wasteful number, since it uses less digits than its factorization.

88191921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 56735.

The product of its digits is 10368, while the sum is 39.

The square root of 88191921 is about 9391.0553720016. The cubic root of 88191921 is about 445.1191382392.

The spelling of 88191921 in words is "eighty-eight million, one hundred ninety-one thousand, nine hundred twenty-one".