102131191 has 4 divisors (see below), whose sum is σ = 102227800. Its totient is φ = 102034584.

The previous prime is 102131177. The next prime is 102131209. The reversal of 102131191 is 191131201.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 191131201 = 3301 ⋅57901.

It is a cyclic number.

It is not a de Polignac number, because 102131191 - 2¹¹ = 102129143 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 (102131111) 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, 46701 + ... + 48838.

It is an arithmetic number, because the mean of its divisors is an integer number (25556950).

Almost surely, 2^102131191 is an apocalyptic number.

102131191 is a deficient number, since it is larger than the sum of its proper divisors (96609).

102131191 is an equidigital number, since it uses as much as digits as its factorization.

102131191 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 96608.

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

The square root of 102131191 is about 10105.9977735996. The cubic root of 102131191 is about 467.4331031849.

Adding to 102131191 its reverse (191131201), we get a palindrome (293262392).

The spelling of 102131191 in words is "one hundred two million, one hundred thirty-one thousand, one hundred ninety-one".