318140749 has 2 divisors, whose sum is σ = 318140750. Its totient is φ = 318140748.

The previous prime is 318140729. The next prime is 318140773. The reversal of 318140749 is 947041813.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 304502500 + 13638249 = 17450^2 + 3693^2 .

It is a cyclic number.

It is not a de Polignac number, because 318140749 - 2¹³ = 318132557 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 (318140729) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 159070374 + 159070375.

It is an arithmetic number, because the mean of its divisors is an integer number (159070375).

Almost surely, 2^318140749 is an apocalyptic number.

It is an amenable number.

318140749 is a deficient number, since it is larger than the sum of its proper divisors (1).

318140749 is an equidigital number, since it uses as much as digits as its factorization.

318140749 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 24192, while the sum is 37.

The square root of 318140749 is about 17836.5004695428. The cubic root of 318140749 is about 682.6631070852.

The spelling of 318140749 in words is "three hundred eighteen million, one hundred forty thousand, seven hundred forty-nine".