818240749 has 2 divisors, whose sum is σ = 818240750. Its totient is φ = 818240748.

The previous prime is 818240741. The next prime is 818240791. The reversal of 818240749 is 947042818.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 591948900 + 226291849 = 24330^2 + 15043^2 .

It is a cyclic number.

It is not a de Polignac number, because 818240749 - 2³ = 818240741 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (818240741) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 409120374 + 409120375.

It is an arithmetic number, because the mean of its divisors is an integer number (409120375).

Almost surely, 2^818240749 is an apocalyptic number.

It is an amenable number.

818240749 is a deficient number, since it is larger than the sum of its proper divisors (1).

818240749 is an equidigital number, since it uses as much as digits as its factorization.

818240749 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 129024, while the sum is 43.

The square root of 818240749 is about 28604.9077782118. The cubic root of 818240749 is about 935.3203165343.

The spelling of 818240749 in words is "eight hundred eighteen million, two hundred forty thousand, seven hundred forty-nine".