102111391 has 8 divisors (see below), whose sum is σ = 103474800. Its totient is φ = 100752960.

The previous prime is 102111389. The next prime is 102111397. The reversal of 102111391 is 193111201.

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 102111391 - 2¹ = 102111389 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 (102111397) 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, 57781 + ... + 59521.

It is an arithmetic number, because the mean of its divisors is an integer number (12934350).

Almost surely, 2^102111391 is an apocalyptic number.

102111391 is a deficient number, since it is larger than the sum of its proper divisors (1363409).

102111391 is an equidigital number, since it uses as much as digits as its factorization.

102111391 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2489.

The product of its (nonzero) digits is 54, while the sum is 19.

The square root of 102111391 is about 10105.0181098304. The cubic root of 102111391 is about 467.4028944128.

Adding to 102111391 its reverse (193111201), we get a palindrome (295222592).

The spelling of 102111391 in words is "one hundred two million, one hundred eleven thousand, three hundred ninety-one".