102243991 has 8 divisors (see below), whose sum is σ = 105685200. Its totient is φ = 98859840.

The previous prime is 102243989. The next prime is 102244003. The reversal of 102243991 is 199342201.

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 102243991 - 2¹ = 102243989 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (102243391) 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, 10606 + ... + 17803.

It is an arithmetic number, because the mean of its divisors is an integer number (13210650).

Almost surely, 2^102243991 is an apocalyptic number.

102243991 is a deficient number, since it is larger than the sum of its proper divisors (3441209).

102243991 is an equidigital number, since it uses as much as digits as its factorization.

102243991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28529.

The product of its (nonzero) digits is 3888, while the sum is 31.

The square root of 102243991 is about 10111.5770777856. The cubic root of 102243991 is about 467.6051272061.

The spelling of 102243991 in words is "one hundred two million, two hundred forty-three thousand, nine hundred ninety-one".