687173441 has 2 divisors, whose sum is σ = 687173442. Its totient is φ = 687173440.

The previous prime is 687173423. The next prime is 687173477. The reversal of 687173441 is 144371786.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 661569841 + 25603600 = 25721^2 + 5060^2 .

It is a cyclic number.

It is not a de Polignac number, because 687173441 - 2¹⁴ = 687157057 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (687173401) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 343586720 + 343586721.

It is an arithmetic number, because the mean of its divisors is an integer number (343586721).

Almost surely, 2^687173441 is an apocalyptic number.

It is an amenable number.

687173441 is a deficient number, since it is larger than the sum of its proper divisors (1).

687173441 is an equidigital number, since it uses as much as digits as its factorization.

687173441 is an evil number, because the sum of its binary digits is even.

The product of its digits is 112896, while the sum is 41.

The square root of 687173441 is about 26213.9932288082. The cubic root of 687173441 is about 882.4473202430.

The spelling of 687173441 in words is "six hundred eighty-seven million, one hundred seventy-three thousand, four hundred forty-one".