677857261 has 2 divisors, whose sum is σ = 677857262. Its totient is φ = 677857260.

The previous prime is 677857259. The next prime is 677857277. The reversal of 677857261 is 162758776.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 613552900 + 64304361 = 24770^2 + 8019^2 .

It is a cyclic number.

It is not a de Polignac number, because 677857261 - 2¹ = 677857259 is a prime.

Together with 677857259, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (677857241) 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, 338928630 + 338928631.

It is an arithmetic number, because the mean of its divisors is an integer number (338928631).

Almost surely, 2^677857261 is an apocalyptic number.

It is an amenable number.

677857261 is a deficient number, since it is larger than the sum of its proper divisors (1).

677857261 is an equidigital number, since it uses as much as digits as its factorization.

677857261 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 987840, while the sum is 49.

The square root of 677857261 is about 26035.6920591714. The cubic root of 677857261 is about 878.4413097739.

The spelling of 677857261 in words is "six hundred seventy-seven million, eight hundred fifty-seven thousand, two hundred sixty-one".