812672491 has 2 divisors, whose sum is σ = 812672492. Its totient is φ = 812672490.

The previous prime is 812672473. The next prime is 812672507. The reversal of 812672491 is 194276218.

812672491 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 812672491 - 2⁵ = 812672459 is a prime.

It is not a weakly prime, because it can be changed into another prime (812672291) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 406336245 + 406336246.

It is an arithmetic number, because the mean of its divisors is an integer number (406336246).

Almost surely, 2^812672491 is an apocalyptic number.

812672491 is a deficient number, since it is larger than the sum of its proper divisors (1).

812672491 is an equidigital number, since it uses as much as digits as its factorization.

812672491 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 48384, while the sum is 40.

The square root of 812672491 is about 28507.4111592056. The cubic root of 812672491 is about 933.1938178224.

The spelling of 812672491 in words is "eight hundred twelve million, six hundred seventy-two thousand, four hundred ninety-one".