102131245 has 4 divisors (see below), whose sum is σ = 122557500. Its totient is φ = 81704992.

The previous prime is 102131233. The next prime is 102131269. The reversal of 102131245 is 542131201.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 542131201 = 21061 ⋅25741.

It can be written as a sum of positive squares in 2 ways, for example, as 36796356 + 65334889 = 6066^2 + 8083^2 .

It is a cyclic number.

It is not a de Polignac number, because 102131245 - 2¹¹ = 102129197 is a prime.

It is a congruent number.

It is an unprimeable number.

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, 10213120 + ... + 10213129.

It is an arithmetic number, because the mean of its divisors is an integer number (30639375).

Almost surely, 2^102131245 is an apocalyptic number.

It is an amenable number.

102131245 is a deficient number, since it is larger than the sum of its proper divisors (20426255).

102131245 is an equidigital number, since it uses as much as digits as its factorization.

102131245 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20426254.

The product of its (nonzero) digits is 240, while the sum is 19.

The square root of 102131245 is about 10106.0004452800. Note that the first 3 decimals coincide. The cubic root of 102131245 is about 467.4331855671.

Adding to 102131245 its reverse (542131201), we get a palindrome (644262446).

The spelling of 102131245 in words is "one hundred two million, one hundred thirty-one thousand, two hundred forty-five".