812651417 has 2 divisors, whose sum is σ = 812651418. Its totient is φ = 812651416.

The previous prime is 812651393. The next prime is 812651419. The reversal of 812651417 is 714156218.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 533794816 + 278856601 = 23104^2 + 16699^2 .

It is a cyclic number.

It is not a de Polignac number, because 812651417 - 2¹² = 812647321 is a prime.

Together with 812651419, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (812651419) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 406325708 + 406325709.

It is an arithmetic number, because the mean of its divisors is an integer number (406325709).

Almost surely, 2^812651417 is an apocalyptic number.

It is an amenable number.

812651417 is a deficient number, since it is larger than the sum of its proper divisors (1).

812651417 is an equidigital number, since it uses as much as digits as its factorization.

812651417 is an evil number, because the sum of its binary digits is even.

The product of its digits is 13440, while the sum is 35.

The square root of 812651417 is about 28507.0415336281. The cubic root of 812651417 is about 933.1857513107.

The spelling of 812651417 in words is "eight hundred twelve million, six hundred fifty-one thousand, four hundred seventeen".