677451221 has 2 divisors, whose sum is σ = 677451222. Its totient is φ = 677451220.

The previous prime is 677451193. The next prime is 677451233. The reversal of 677451221 is 122154776.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 665124100 + 12327121 = 25790^2 + 3511^2 .

It is a cyclic number.

It is not a de Polignac number, because 677451221 - 2¹⁴ = 677434837 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (677451721) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 338725610 + 338725611.

It is an arithmetic number, because the mean of its divisors is an integer number (338725611).

Almost surely, 2^677451221 is an apocalyptic number.

It is an amenable number.

677451221 is a deficient number, since it is larger than the sum of its proper divisors (1).

677451221 is an equidigital number, since it uses as much as digits as its factorization.

677451221 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 23520, while the sum is 35.

The square root of 677451221 is about 26027.8931340975. The cubic root of 677451221 is about 878.2658777806.

The spelling of 677451221 in words is "six hundred seventy-seven million, four hundred fifty-one thousand, two hundred twenty-one".