88991813 has 4 divisors (see below), whose sum is σ = 89100768. Its totient is φ = 88882860.

The previous prime is 88991797. The next prime is 88991827. The reversal of 88991813 is 31819988.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 88991813 - 2⁴ = 88991797 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 (88991113) 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 3 ways as a sum of consecutive naturals, for example, 53243 + ... + 54888.

It is an arithmetic number, because the mean of its divisors is an integer number (22275192).

Almost surely, 2^88991813 is an apocalyptic number.

It is an amenable number.

88991813 is a deficient number, since it is larger than the sum of its proper divisors (108955).

88991813 is a wasteful number, since it uses less digits than its factorization.

88991813 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 108954.

The product of its digits is 124416, while the sum is 47.

The square root of 88991813 is about 9433.5472119453. The cubic root of 88991813 is about 446.4608189259.

The spelling of 88991813 in words is "eighty-eight million, nine hundred ninety-one thousand, eight hundred thirteen".