687016139 has 2 divisors, whose sum is σ = 687016140. Its totient is φ = 687016138.

The previous prime is 687016097. The next prime is 687016147. The reversal of 687016139 is 931610786.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-687016139 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 687016096 and 687016105.

It is not a weakly prime, because it can be changed into another prime (687016159) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 343508069 + 343508070.

It is an arithmetic number, because the mean of its divisors is an integer number (343508070).

Almost surely, 2^687016139 is an apocalyptic number.

687016139 is a deficient number, since it is larger than the sum of its proper divisors (1).

687016139 is an equidigital number, since it uses as much as digits as its factorization.

687016139 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 54432, while the sum is 41.

The square root of 687016139 is about 26210.9927129821. The cubic root of 687016139 is about 882.3799809497.

The spelling of 687016139 in words is "six hundred eighty-seven million, sixteen thousand, one hundred thirty-nine".