102131311 has 4 divisors (see below), whose sum is σ = 102161224. Its totient is φ = 102101400.

The previous prime is 102131269. The next prime is 102131347. The reversal of 102131311 is 113131201.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 113131201 = 1069 ⋅105829.

It is a cyclic number.

It is not a de Polignac number, because 102131311 - 2²¹ = 100034159 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 102131291 and 102131300.

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, 9060 + ... + 16921.

It is an arithmetic number, because the mean of its divisors is an integer number (25540306).

Almost surely, 2^102131311 is an apocalyptic number.

102131311 is a deficient number, since it is larger than the sum of its proper divisors (29913).

102131311 is an equidigital number, since it uses as much as digits as its factorization.

102131311 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29912.

The product of its (nonzero) digits is 18, while the sum is 13.

The square root of 102131311 is about 10106.0037106662. The cubic root of 102131311 is about 467.4332862564.

Adding to 102131311 its reverse (113131201), we get a palindrome (215262512).

The spelling of 102131311 in words is "one hundred two million, one hundred thirty-one thousand, three hundred eleven".