687190037 has 2 divisors, whose sum is σ = 687190038. Its totient is φ = 687190036.

The previous prime is 687189947. The next prime is 687190039. The reversal of 687190037 is 730091786.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 384395236 + 302794801 = 19606^2 + 17401^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-687190037 is a prime.

It is a super-2 number, since 2×687190037² = 944460293904122738, which contains 22 as substring.

Together with 687190039, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 687189976 and 687190003.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (687190039) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 343595018 + 343595019.

It is an arithmetic number, because the mean of its divisors is an integer number (343595019).

Almost surely, 2^687190037 is an apocalyptic number.

It is an amenable number.

687190037 is a deficient number, since it is larger than the sum of its proper divisors (1).

687190037 is an equidigital number, since it uses as much as digits as its factorization.

687190037 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 63504, while the sum is 41.

The square root of 687190037 is about 26214.3097753879. The cubic root of 687190037 is about 882.4544242126.

The spelling of 687190037 in words is "six hundred eighty-seven million, one hundred ninety thousand, thirty-seven".