812569949 has 2 divisors, whose sum is σ = 812569950. Its totient is φ = 812569948.

The previous prime is 812569943. The next prime is 812569973. The reversal of 812569949 is 949965218.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 679905625 + 132664324 = 26075^2 + 11518^2 .

It is a cyclic number.

It is not a de Polignac number, because 812569949 - 2²⁴ = 795792733 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 812569949.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (812569943) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 406284974 + 406284975.

It is an arithmetic number, because the mean of its divisors is an integer number (406284975).

Almost surely, 2^812569949 is an apocalyptic number.

It is an amenable number.

812569949 is a deficient number, since it is larger than the sum of its proper divisors (1).

812569949 is an equidigital number, since it uses as much as digits as its factorization.

812569949 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1399680, while the sum is 53.

The square root of 812569949 is about 28505.6125876993. The cubic root of 812569949 is about 933.1545664280.

The spelling of 812569949 in words is "eight hundred twelve million, five hundred sixty-nine thousand, nine hundred forty-nine".