1673521213 has 8 divisors (see below), whose sum is σ = 2059718528. Its totient is φ = 1324104624.

The previous prime is 1673521177. The next prime is 1673521271. The reversal of 1673521213 is 3121253761.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1673521213 - 2⁹ = 1673520701 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1673521013) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9195081 + ... + 9195262.

It is an arithmetic number, because the mean of its divisors is an integer number (257464816).

Almost surely, 2^1673521213 is an apocalyptic number.

1673521213 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

It is an amenable number.

1673521213 is a deficient number, since it is larger than the sum of its proper divisors (386197315).

1673521213 is a wasteful number, since it uses less digits than its factorization.

1673521213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18390363.

The product of its digits is 7560, while the sum is 31.

The square root of 1673521213 is about 40908.6936115051. The cubic root of 1673521213 is about 1187.2542709720.

Adding to 1673521213 its reverse (3121253761), we get a palindrome (4794774974).

The spelling of 1673521213 in words is "one billion, six hundred seventy-three million, five hundred twenty-one thousand, two hundred thirteen".