1687242923 has 2 divisors, whose sum is σ = 1687242924. Its totient is φ = 1687242922.

The previous prime is 1687242899. The next prime is 1687242967. The reversal of 1687242923 is 3292427861.

It is an a-pointer prime, because the next prime (1687242967) can be obtained adding 1687242923 to its sum of digits (44).

It is a weak prime.

It is an emirp because it is prime and its reverse (3292427861) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1687242923 - 2²⁴ = 1670465707 is a prime.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (1687242223) 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 as a sum of consecutive naturals, namely, 843621461 + 843621462.

It is an arithmetic number, because the mean of its divisors is an integer number (843621462).

Almost surely, 2^1687242923 is an apocalyptic number.

1687242923 is a deficient number, since it is larger than the sum of its proper divisors (1).

1687242923 is an equidigital number, since it uses as much as digits as its factorization.

1687242923 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 290304, while the sum is 44.

The square root of 1687242923 is about 41076.0626521092. The cubic root of 1687242923 is about 1190.4903289725.

It can be divided in two parts, 16872 and 42923, that added together give a palindrome (59795).

The spelling of 1687242923 in words is "one billion, six hundred eighty-seven million, two hundred forty-two thousand, nine hundred twenty-three".