672732121 has 2 divisors, whose sum is σ = 672732122. Its totient is φ = 672732120.

The previous prime is 672732079. The next prime is 672732131. The reversal of 672732121 is 121237276.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 620010000 + 52722121 = 24900^2 + 7261^2 .

It is a cyclic number.

It is not a de Polignac number, because 672732121 - 2¹¹ = 672730073 is a prime.

It is not a weakly prime, because it can be changed into another prime (672732131) 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 as a sum of consecutive naturals, namely, 336366060 + 336366061.

It is an arithmetic number, because the mean of its divisors is an integer number (336366061).

Almost surely, 2^672732121 is an apocalyptic number.

It is an amenable number.

672732121 is a deficient number, since it is larger than the sum of its proper divisors (1).

672732121 is an equidigital number, since it uses as much as digits as its factorization.

672732121 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 7056, while the sum is 31.

The square root of 672732121 is about 25937.0800399737. The cubic root of 672732121 is about 876.2218016123.

Adding to 672732121 its reverse (121237276), we get a palindrome (793969397).

The spelling of 672732121 in words is "six hundred seventy-two million, seven hundred thirty-two thousand, one hundred twenty-one".