677124221 has 2 divisors, whose sum is σ = 677124222. Its totient is φ = 677124220.

The previous prime is 677124157. The next prime is 677124251. The reversal of 677124221 is 122421776.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 353628025 + 323496196 = 18805^2 + 17986^2 .

It is a cyclic number.

It is not a de Polignac number, because 677124221 - 2⁶ = 677124157 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (677124251) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 338562110 + 338562111.

It is an arithmetic number, because the mean of its divisors is an integer number (338562111).

Almost surely, 2^677124221 is an apocalyptic number.

It is an amenable number.

677124221 is a deficient number, since it is larger than the sum of its proper divisors (1).

677124221 is an equidigital number, since it uses as much as digits as its factorization.

677124221 is an evil number, because the sum of its binary digits is even.

The product of its digits is 9408, while the sum is 32.

The square root of 677124221 is about 26021.6106534549. The cubic root of 677124221 is about 878.1245445234.

Adding to 677124221 its reverse (122421776), we get a palindrome (799545997).

The spelling of 677124221 in words is "six hundred seventy-seven million, one hundred twenty-four thousand, two hundred twenty-one".