1673642281 has 4 divisors (see below), whose sum is σ = 1673726464. Its totient is φ = 1673558100.

The previous prime is 1673642273. The next prime is 1673642323. The reversal of 1673642281 is 1822463761.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 1822463761 = 73 ⋅24965257.

It is a cyclic number.

It is not a de Polignac number, because 1673642281 - 2³ = 1673642273 is a prime.

It is a super-2 number, since 2×1673642281² = 5602156969501765922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1673642261) 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 in 3 ways as a sum of consecutive naturals, for example, 6196 + ... + 58186.

It is an arithmetic number, because the mean of its divisors is an integer number (418431616).

Almost surely, 2^1673642281 is an apocalyptic number.

It is an amenable number.

1673642281 is a deficient number, since it is larger than the sum of its proper divisors (84183).

1673642281 is an equidigital number, since it uses as much as digits as its factorization.

1673642281 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 84182.

The product of its digits is 96768, while the sum is 40.

The square root of 1673642281 is about 40910.1733191146. The cubic root of 1673642281 is about 1187.2829002345.

The spelling of 1673642281 in words is "one billion, six hundred seventy-three million, six hundred forty-two thousand, two hundred eighty-one".