687451343 has 2 divisors, whose sum is σ = 687451344. Its totient is φ = 687451342.

The previous prime is 687451339. The next prime is 687451399. The reversal of 687451343 is 343154786.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 687451343 - 2² = 687451339 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 687451343.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (687451313) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 343725671 + 343725672.

It is an arithmetic number, because the mean of its divisors is an integer number (343725672).

Almost surely, 2^687451343 is an apocalyptic number.

687451343 is a deficient number, since it is larger than the sum of its proper divisors (1).

687451343 is an equidigital number, since it uses as much as digits as its factorization.

687451343 is an evil number, because the sum of its binary digits is even.

The product of its digits is 241920, while the sum is 41.

The square root of 687451343 is about 26219.2933352522. The cubic root of 687451343 is about 882.5662619877.

The spelling of 687451343 in words is "six hundred eighty-seven million, four hundred fifty-one thousand, three hundred forty-three".