1673653021 has 2 divisors, whose sum is σ = 1673653022. Its totient is φ = 1673653020.

The previous prime is 1673653001. The next prime is 1673653039. The reversal of 1673653021 is 1203563761.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1111488921 + 562164100 = 33339^2 + 23710^2 .

It is a cyclic number.

It is not a de Polignac number, because 1673653021 - 2⁹ = 1673652509 is a prime.

It is a super-2 number, since 2×1673653021² = 5602228869404852882, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1673653001) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 836826510 + 836826511.

It is an arithmetic number, because the mean of its divisors is an integer number (836826511).

Almost surely, 2^1673653021 is an apocalyptic number.

It is an amenable number.

1673653021 is a deficient number, since it is larger than the sum of its proper divisors (1).

1673653021 is an equidigital number, since it uses as much as digits as its factorization.

1673653021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 22680, while the sum is 34.

The square root of 1673653021 is about 40910.3045820977. The cubic root of 1673653021 is about 1187.2854398833.

The spelling of 1673653021 in words is "one billion, six hundred seventy-three million, six hundred fifty-three thousand, twenty-one".