2520720749 has 2 divisors, whose sum is σ = 2520720750. Its totient is φ = 2520720748.

The previous prime is 2520720743. The next prime is 2520720791. The reversal of 2520720749 is 9470270252.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2380464100 + 140256649 = 48790^2 + 11843^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2520720749 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2520720743) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1260360374 + 1260360375.

It is an arithmetic number, because the mean of its divisors is an integer number (1260360375).

Almost surely, 2^2520720749 is an apocalyptic number.

It is an amenable number.

2520720749 is a deficient number, since it is larger than the sum of its proper divisors (1).

2520720749 is an equidigital number, since it uses as much as digits as its factorization.

2520720749 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 70560, while the sum is 38.

The square root of 2520720749 is about 50206.7799106854. The cubic root of 2520720749 is about 1360.9481474003.

The spelling of 2520720749 in words is "two billion, five hundred twenty million, seven hundred twenty thousand, seven hundred forty-nine".