674137721 has 2 divisors, whose sum is σ = 674137722. Its totient is φ = 674137720.

The previous prime is 674137693. The next prime is 674137729. The reversal of 674137721 is 127731476.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 657204496 + 16933225 = 25636^2 + 4115^2 .

It is a cyclic number.

It is not a de Polignac number, because 674137721 - 2¹⁸ = 673875577 is a prime.

It is not a weakly prime, because it can be changed into another prime (674137729) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 337068860 + 337068861.

It is an arithmetic number, because the mean of its divisors is an integer number (337068861).

Almost surely, 2^674137721 is an apocalyptic number.

It is an amenable number.

674137721 is a deficient number, since it is larger than the sum of its proper divisors (1).

674137721 is an equidigital number, since it uses as much as digits as its factorization.

674137721 is an evil number, because the sum of its binary digits is even.

The product of its digits is 49392, while the sum is 38.

The square root of 674137721 is about 25964.1622433692. The cubic root of 674137721 is about 876.8316335418.

The spelling of 674137721 in words is "six hundred seventy-four million, one hundred thirty-seven thousand, seven hundred twenty-one".