1674451721 has 2 divisors, whose sum is σ = 1674451722. Its totient is φ = 1674451720.

The previous prime is 1674451663. The next prime is 1674451781. The reversal of 1674451721 is 1271544761.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1039159696 + 635292025 = 32236^2 + 25205^2 .

It is a cyclic number.

It is not a de Polignac number, because 1674451721 - 2¹⁸ = 1674189577 is a prime.

It is not a weakly prime, because it can be changed into another prime (1674451781) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 837225860 + 837225861.

It is an arithmetic number, because the mean of its divisors is an integer number (837225861).

Almost surely, 2^1674451721 is an apocalyptic number.

It is an amenable number.

1674451721 is a deficient number, since it is larger than the sum of its proper divisors (1).

1674451721 is an equidigital number, since it uses as much as digits as its factorization.

1674451721 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 47040, while the sum is 38.

The square root of 1674451721 is about 40920.0650170549. The cubic root of 1674451721 is about 1187.4742751362.

The spelling of 1674451721 in words is "one billion, six hundred seventy-four million, four hundred fifty-one thousand, seven hundred twenty-one".