2981439749 has 2 divisors, whose sum is σ = 2981439750. Its totient is φ = 2981439748.

The previous prime is 2981439731. The next prime is 2981439779. The reversal of 2981439749 is 9479341892.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2897130625 + 84309124 = 53825^2 + 9182^2 .

It is a cyclic number.

It is not a de Polignac number, because 2981439749 - 2⁸ = 2981439493 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 2981439694 and 2981439703.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2981439779) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1490719874 + 1490719875.

It is an arithmetic number, because the mean of its divisors is an integer number (1490719875).

Almost surely, 2^2981439749 is an apocalyptic number.

It is an amenable number.

2981439749 is a deficient number, since it is larger than the sum of its proper divisors (1).

2981439749 is an equidigital number, since it uses as much as digits as its factorization.

2981439749 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3919104, while the sum is 56.

The square root of 2981439749 is about 54602.5617439329. The cubic root of 2981439749 is about 1439.2691360935.

The spelling of 2981439749 in words is "two billion, nine hundred eighty-one million, four hundred thirty-nine thousand, seven hundred forty-nine".