88931991 has 8 divisors (see below), whose sum is σ = 119372400. Its totient is φ = 58889792.

The previous prime is 88931987. The next prime is 88932001. The reversal of 88931991 is 19913988.

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 88931991 - 2² = 88931987 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 88931991.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (88931291) 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, 99030 + ... + 99923.

It is an arithmetic number, because the mean of its divisors is an integer number (14921550).

Almost surely, 2^88931991 is an apocalyptic number.

88931991 is a deficient number, since it is larger than the sum of its proper divisors (30440409).

88931991 is a wasteful number, since it uses less digits than its factorization.

88931991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 199105.

The product of its digits is 139968, while the sum is 48.

The square root of 88931991 is about 9430.3759734170. The cubic root of 88931991 is about 446.3607566654.

The spelling of 88931991 in words is "eighty-eight million, nine hundred thirty-one thousand, nine hundred ninety-one".