673751521 has 2 divisors, whose sum is σ = 673751522. Its totient is φ = 673751520.

The previous prime is 673751513. The next prime is 673751567. The reversal of 673751521 is 125157376.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 671379921 + 2371600 = 25911^2 + 1540^2 .

It is a cyclic number.

It is not a de Polignac number, because 673751521 - 2³ = 673751513 is a prime.

It is a super-2 number, since 2×673751521² = 907882224099626882, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (673751321) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 336875760 + 336875761.

It is an arithmetic number, because the mean of its divisors is an integer number (336875761).

Almost surely, 2^673751521 is an apocalyptic number.

It is an amenable number.

673751521 is a deficient number, since it is larger than the sum of its proper divisors (1).

673751521 is an equidigital number, since it uses as much as digits as its factorization.

673751521 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 44100, while the sum is 37.

The square root of 673751521 is about 25956.7240036180. The cubic root of 673751521 is about 876.6641617962.

The spelling of 673751521 in words is "six hundred seventy-three million, seven hundred fifty-one thousand, five hundred twenty-one".