102052191 has 4 divisors (see below), whose sum is σ = 136069592. Its totient is φ = 68034792.

The previous prime is 102052187. The next prime is 102052199. The reversal of 102052191 is 191250201.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 102052191 - 2² = 102052187 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 (102052199) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 17008696 + ... + 17008701.

It is an arithmetic number, because the mean of its divisors is an integer number (34017398).

Almost surely, 2^102052191 is an apocalyptic number.

102052191 is a deficient number, since it is larger than the sum of its proper divisors (34017401).

102052191 is an equidigital number, since it uses as much as digits as its factorization.

102052191 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34017400.

The product of its (nonzero) digits is 180, while the sum is 21.

The square root of 102052191 is about 10102.0884474449. The cubic root of 102052191 is about 467.3125499365.

The spelling of 102052191 in words is "one hundred two million, fifty-two thousand, one hundred ninety-one".