687148369 has 2 divisors, whose sum is σ = 687148370. Its totient is φ = 687148368.

The previous prime is 687148321. The next prime is 687148373. The reversal of 687148369 is 963841786.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 660233025 + 26915344 = 25695^2 + 5188^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-687148369 is a prime.

It is a super-2 number, since 2×687148369² = 944345762038720322, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (687148309) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 343574184 + 343574185.

It is an arithmetic number, because the mean of its divisors is an integer number (343574185).

Almost surely, 2^687148369 is an apocalyptic number.

It is an amenable number.

687148369 is a deficient number, since it is larger than the sum of its proper divisors (1).

687148369 is an equidigital number, since it uses as much as digits as its factorization.

687148369 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1741824, while the sum is 52.

The square root of 687148369 is about 26213.5150065763. The cubic root of 687148369 is about 882.4365878781.

The spelling of 687148369 in words is "six hundred eighty-seven million, one hundred forty-eight thousand, three hundred sixty-nine".