102208391 has 8 divisors (see below), whose sum is σ = 107730480. Its totient is φ = 96700608.

The previous prime is 102208373. The next prime is 102208397. The reversal of 102208391 is 193802201.

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 102208391 - 2²² = 98014087 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 102208391.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (102208397) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13145 + ... + 19421.

It is an arithmetic number, because the mean of its divisors is an integer number (13466310).

Almost surely, 2^102208391 is an apocalyptic number.

102208391 is a deficient number, since it is larger than the sum of its proper divisors (5522089).

102208391 is an equidigital number, since it uses as much as digits as its factorization.

102208391 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7153.

The product of its (nonzero) digits is 864, while the sum is 26.

The square root of 102208391 is about 10109.8165660906. The cubic root of 102208391 is about 467.5508496073.

The spelling of 102208391 in words is "one hundred two million, two hundred eight thousand, three hundred ninety-one".