102406191 has 4 divisors (see below), whose sum is σ = 136541592. Its totient is φ = 68270792.

The previous prime is 102406141. The next prime is 102406247. The reversal of 102406191 is 191604201.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 191604201 = 3 ⋅63868067.

It is a cyclic number.

It is not a de Polignac number, because 102406191 - 2¹⁵ = 102373423 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (102406111) 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 3 ways as a sum of consecutive naturals, for example, 17067696 + ... + 17067701.

It is an arithmetic number, because the mean of its divisors is an integer number (34135398).

Almost surely, 2^102406191 is an apocalyptic number.

102406191 is a deficient number, since it is larger than the sum of its proper divisors (34135401).

102406191 is an equidigital number, since it uses as much as digits as its factorization.

102406191 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34135400.

The product of its (nonzero) digits is 432, while the sum is 24.

The square root of 102406191 is about 10119.5944088684. The cubic root of 102406191 is about 467.8522663583.

The spelling of 102406191 in words is "one hundred two million, four hundred six thousand, one hundred ninety-one".