674461721 has 2 divisors, whose sum is σ = 674461722. Its totient is φ = 674461720.

The previous prime is 674461693. The next prime is 674461727. The reversal of 674461721 is 127164476.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 664608400 + 9853321 = 25780^2 + 3139^2 .

It is a cyclic number.

It is not a de Polignac number, because 674461721 - 2¹⁸ = 674199577 is a prime.

It is a super-2 number, since 2×674461721² = 909797226188563682, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (674461727) 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, 337230860 + 337230861.

It is an arithmetic number, because the mean of its divisors is an integer number (337230861).

Almost surely, 2^674461721 is an apocalyptic number.

It is an amenable number.

674461721 is a deficient number, since it is larger than the sum of its proper divisors (1).

674461721 is an equidigital number, since it uses as much as digits as its factorization.

674461721 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 56448, while the sum is 38.

The square root of 674461721 is about 25970.4008632905. The cubic root of 674461721 is about 876.9720835515.

The spelling of 674461721 in words is "six hundred seventy-four million, four hundred sixty-one thousand, seven hundred twenty-one".