812976161749 has 2 divisors, whose sum is σ = 812976161750. Its totient is φ = 812976161748.

The previous prime is 812976161747. The next prime is 812976161783. The reversal of 812976161749 is 947161679218.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 709102094724 + 103874067025 = 842082^2 + 322295^2 .

It is a cyclic number.

It is not a de Polignac number, because 812976161749 - 2¹ = 812976161747 is a prime.

Together with 812976161747, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (812976161747) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 406488080874 + 406488080875.

It is an arithmetic number, because the mean of its divisors is an integer number (406488080875).

Almost surely, 2^812976161749 is an apocalyptic number.

It is an amenable number.

812976161749 is a deficient number, since it is larger than the sum of its proper divisors (1).

812976161749 is an equidigital number, since it uses as much as digits as its factorization.

812976161749 is an evil number, because the sum of its binary digits is even.

The product of its digits is 9144576, while the sum is 61.

The spelling of 812976161749 in words is "eight hundred twelve billion, nine hundred seventy-six million, one hundred sixty-one thousand, seven hundred forty-nine".