687156059 has 2 divisors, whose sum is σ = 687156060. Its totient is φ = 687156058.

The previous prime is 687156049. The next prime is 687156061. The reversal of 687156059 is 950651786.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 687156059 - 2²⁰ = 686107483 is a prime.

It is a super-2 number, since 2×687156059² = 944366898840822962, which contains 22 as substring.

Together with 687156061, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (687156049) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 343578029 + 343578030.

It is an arithmetic number, because the mean of its divisors is an integer number (343578030).

Almost surely, 2^687156059 is an apocalyptic number.

687156059 is a deficient number, since it is larger than the sum of its proper divisors (1).

687156059 is an equidigital number, since it uses as much as digits as its factorization.

687156059 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 453600, while the sum is 47.

The square root of 687156059 is about 26213.6616862277. The cubic root of 687156059 is about 882.4398797009.

The spelling of 687156059 in words is "six hundred eighty-seven million, one hundred fifty-six thousand, fifty-nine".