810147749 has 2 divisors, whose sum is σ = 810147750. Its totient is φ = 810147748.

The previous prime is 810147743. The next prime is 810147787. The reversal of 810147749 is 947741018.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 705964900 + 104182849 = 26570^2 + 10207^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-810147749 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (810147743) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 405073874 + 405073875.

It is an arithmetic number, because the mean of its divisors is an integer number (405073875).

Almost surely, 2^810147749 is an apocalyptic number.

It is an amenable number.

810147749 is a deficient number, since it is larger than the sum of its proper divisors (1).

810147749 is an equidigital number, since it uses as much as digits as its factorization.

810147749 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 56448, while the sum is 41.

The square root of 810147749 is about 28463.0945085035. The cubic root of 810147749 is about 932.2264261793.

The spelling of 810147749 in words is "eight hundred ten million, one hundred forty-seven thousand, seven hundred forty-nine".