812672129 has 2 divisors, whose sum is σ = 812672130. Its totient is φ = 812672128.

The previous prime is 812672117. The next prime is 812672137. The reversal of 812672129 is 921276218.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 598927729 + 213744400 = 24473^2 + 14620^2 .

It is a cyclic number.

It is not a de Polignac number, because 812672129 - 2¹² = 812668033 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 812672092 and 812672101.

It is not a weakly prime, because it can be changed into another prime (812672149) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 406336064 + 406336065.

It is an arithmetic number, because the mean of its divisors is an integer number (406336065).

Almost surely, 2^812672129 is an apocalyptic number.

It is an amenable number.

812672129 is a deficient number, since it is larger than the sum of its proper divisors (1).

812672129 is an equidigital number, since it uses as much as digits as its factorization.

812672129 is an evil number, because the sum of its binary digits is even.

The product of its digits is 24192, while the sum is 38.

The square root of 812672129 is about 28507.4048099788. The cubic root of 812672129 is about 933.1936792606.

The spelling of 812672129 in words is "eight hundred twelve million, six hundred seventy-two thousand, one hundred twenty-nine".