1672545221 has 16 divisors (see below), whose sum is σ = 1808059968. Its totient is φ = 1541280000.

The previous prime is 1672545181. The next prime is 1672545223. The reversal of 1672545221 is 1225452761.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1672545221 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1672545223) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 512846 + ... + 516096.

It is an arithmetic number, because the mean of its divisors is an integer number (113003748).

Almost surely, 2^1672545221 is an apocalyptic number.

It is an amenable number.

1672545221 is a deficient number, since it is larger than the sum of its proper divisors (135514747).

1672545221 is a wasteful number, since it uses less digits than its factorization.

1672545221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3892.

The product of its digits is 33600, while the sum is 35.

The square root of 1672545221 is about 40896.7629648118. The cubic root of 1672545221 is about 1187.0234251773.

Adding to 1672545221 its reverse (1225452761), we get a palindrome (2897997982).

The spelling of 1672545221 in words is "one billion, six hundred seventy-two million, five hundred forty-five thousand, two hundred twenty-one".