102391 has 8 divisors (see below), whose sum is σ = 114480. Its totient is φ = 91008.

The previous prime is 102367. The next prime is 102397. The reversal of 102391 is 193201.

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 102391 - 2⁵ = 102359 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (102397) 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, 165 + ... + 481.

It is an arithmetic number, because the mean of its divisors is an integer number (14310).

102391 is a Friedman number, since it can be written as 320^(1+1)-9, using all its digits and the basic arithmetic operations.

2¹⁰²³⁹¹ is an apocalyptic number.

102391 is a deficient number, since it is larger than the sum of its proper divisors (12089).

102391 is a wasteful number, since it uses less digits than its factorization.

102391 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 353.

The product of its (nonzero) digits is 54, while the sum is 16.

The square root of 102391 is about 319.9859371910. The cubic root of 102391 is about 46.7829131379.

Adding to 102391 its reverse (193201), we get a palindrome (295592).

It can be divided in two parts, 10 and 2391, that added together give a 4-th power (2401 = 7⁴).

The spelling of 102391 in words is "one hundred two thousand, three hundred ninety-one".