88191821 has 8 divisors (see below), whose sum is σ = 92171520. Its totient is φ = 84224272.

The previous prime is 88191809. The next prime is 88191823. The reversal of 88191821 is 12819188.

It is a happy number.

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 88191821 - 2²² = 83997517 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (88191823) 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, 13871 + ... + 19203.

It is an arithmetic number, because the mean of its divisors is an integer number (11521440).

Almost surely, 2^88191821 is an apocalyptic number.

It is an amenable number.

88191821 is a deficient number, since it is larger than the sum of its proper divisors (3979699).

88191821 is a wasteful number, since it uses less digits than its factorization.

88191821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6075.

The product of its digits is 9216, while the sum is 38.

The square root of 88191821 is about 9391.0500477849. The cubic root of 88191821 is about 445.1189700003.

The spelling of 88191821 in words is "eighty-eight million, one hundred ninety-one thousand, eight hundred twenty-one".