672188009 has 2 divisors, whose sum is σ = 672188010. Its totient is φ = 672188008.

The previous prime is 672187979. The next prime is 672188063. The reversal of 672188009 is 900881276.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 597313600 + 74874409 = 24440^2 + 8653^2 .

It is a cyclic number.

It is not a de Polignac number, because 672188009 - 2²⁴ = 655410793 is a prime.

It is not a weakly prime, because it can be changed into another prime (672188089) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 336094004 + 336094005.

It is an arithmetic number, because the mean of its divisors is an integer number (336094005).

Almost surely, 2^672188009 is an apocalyptic number.

It is an amenable number.

672188009 is a deficient number, since it is larger than the sum of its proper divisors (1).

672188009 is an equidigital number, since it uses as much as digits as its factorization.

672188009 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 48384, while the sum is 41.

The square root of 672188009 is about 25926.5888423448. The cubic root of 672188009 is about 875.9855057790.

The spelling of 672188009 in words is "six hundred seventy-two million, one hundred eighty-eight thousand, nine".