1673558243 has 4 divisors (see below), whose sum is σ = 1912638000. Its totient is φ = 1434478488.

The previous prime is 1673558239. The next prime is 1673558261. The reversal of 1673558243 is 3428553761.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1673558243 - 2² = 1673558239 is a prime.

It is a zygodrome in base 2.

It is a junction number, because it is equal to n+sod(n) for n = 1673558194 and 1673558203.

It is not an unprimeable number, because it can be changed into a prime (1673558203) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 119539868 + ... + 119539881.

It is an arithmetic number, because the mean of its divisors is an integer number (478159500).

Almost surely, 2^1673558243 is an apocalyptic number.

1673558243 is a deficient number, since it is larger than the sum of its proper divisors (239079757).

1673558243 is an equidigital number, since it uses as much as digits as its factorization.

1673558243 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 239079756.

The product of its digits is 604800, while the sum is 44.

The square root of 1673558243 is about 40909.1462022859. The cubic root of 1673558243 is about 1187.2630276983.

The spelling of 1673558243 in words is "one billion, six hundred seventy-three million, five hundred fifty-eight thousand, two hundred forty-three".