1672788917 has 2 divisors, whose sum is σ = 1672788918. Its totient is φ = 1672788916.

The previous prime is 1672788913. The next prime is 1672788947. The reversal of 1672788917 is 7198872761.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1210065796 + 462723121 = 34786^2 + 21511^2 .

It is a cyclic number.

It is not a de Polignac number, because 1672788917 - 2² = 1672788913 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1672788913) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 836394458 + 836394459.

It is an arithmetic number, because the mean of its divisors is an integer number (836394459).

Almost surely, 2^1672788917 is an apocalyptic number.

It is an amenable number.

1672788917 is a deficient number, since it is larger than the sum of its proper divisors (1).

1672788917 is an equidigital number, since it uses as much as digits as its factorization.

1672788917 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2370816, while the sum is 56.

The square root of 1672788917 is about 40899.7422608016. The cubic root of 1672788917 is about 1187.0810736061.

The spelling of 1672788917 in words is "one billion, six hundred seventy-two million, seven hundred eighty-eight thousand, nine hundred seventeen".