102131723 has 2 divisors, whose sum is σ = 102131724. Its totient is φ = 102131722.

The previous prime is 102131713. The next prime is 102131737. The reversal of 102131723 is 327131201.

It is a weak prime.

It is an emirp because it is prime and its reverse (327131201) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-102131723 is a prime.

It is a Sophie Germain prime.

It is a junction number, because it is equal to n+sod(n) for n = 102131695 and 102131704.

It is not a weakly prime, because it can be changed into another prime (102131713) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 51065861 + 51065862.

It is an arithmetic number, because the mean of its divisors is an integer number (51065862).

Almost surely, 2^102131723 is an apocalyptic number.

102131723 is a deficient number, since it is larger than the sum of its proper divisors (1).

102131723 is an equidigital number, since it uses as much as digits as its factorization.

102131723 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 252, while the sum is 20.

The square root of 102131723 is about 10106.0240945685. The cubic root of 102131723 is about 467.4339148011.

Adding to 102131723 its reverse (327131201), we get a palindrome (429262924).

The spelling of 102131723 in words is "one hundred two million, one hundred thirty-one thousand, seven hundred twenty-three".