812065901 has 2 divisors, whose sum is σ = 812065902. Its totient is φ = 812065900.

The previous prime is 812065883. The next prime is 812065921. The reversal of 812065901 is 109560218.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 755425225 + 56640676 = 27485^2 + 7526^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-812065901 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (812065921) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 406032950 + 406032951.

It is an arithmetic number, because the mean of its divisors is an integer number (406032951).

Almost surely, 2^812065901 is an apocalyptic number.

It is an amenable number.

812065901 is a deficient number, since it is larger than the sum of its proper divisors (1).

812065901 is an equidigital number, since it uses as much as digits as its factorization.

812065901 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4320, while the sum is 32.

The square root of 812065901 is about 28496.7700099503. The cubic root of 812065901 is about 932.9615771012.

The spelling of 812065901 in words is "eight hundred twelve million, sixty-five thousand, nine hundred one".