1687648141 has 2 divisors, whose sum is σ = 1687648142. Its totient is φ = 1687648140.

The previous prime is 1687648121. The next prime is 1687648187. The reversal of 1687648141 is 1418467861.

It is an a-pointer prime, because the next prime (1687648187) can be obtained adding 1687648141 to its sum of digits (46).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1634504041 + 53144100 = 40429^2 + 7290^2 .

It is an emirp because it is prime and its reverse (1418467861) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1687648141 - 2⁷ = 1687648013 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1687648091 and 1687648100.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1687648121) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 843824070 + 843824071.

It is an arithmetic number, because the mean of its divisors is an integer number (843824071).

Almost surely, 2^1687648141 is an apocalyptic number.

It is an amenable number.

1687648141 is a deficient number, since it is larger than the sum of its proper divisors (1).

1687648141 is an equidigital number, since it uses as much as digits as its factorization.

1687648141 is an evil number, because the sum of its binary digits is even.

The product of its digits is 258048, while the sum is 46.

The square root of 1687648141 is about 41080.9948881475. The cubic root of 1687648141 is about 1190.5856263537.

The spelling of 1687648141 in words is "one billion, six hundred eighty-seven million, six hundred forty-eight thousand, one hundred forty-one".