769172009 has 2 divisors, whose sum is σ = 769172010. Its totient is φ = 769172008.

The previous prime is 769171999. The next prime is 769172023. The reversal of 769172009 is 900271967.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 600250000 + 168922009 = 24500^2 + 12997^2 .

It is a cyclic number.

It is not a de Polignac number, because 769172009 - 2¹⁶ = 769106473 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (769172099) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 384586004 + 384586005.

It is an arithmetic number, because the mean of its divisors is an integer number (384586005).

Almost surely, 2^769172009 is an apocalyptic number.

It is an amenable number.

769172009 is a deficient number, since it is larger than the sum of its proper divisors (1).

769172009 is an equidigital number, since it uses as much as digits as its factorization.

769172009 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 47628, while the sum is 41.

The square root of 769172009 is about 27733.9504759059. The cubic root of 769172009 is about 916.2369959572.

The spelling of 769172009 in words is "seven hundred sixty-nine million, one hundred seventy-two thousand, nine".