2549723509 has 2 divisors, whose sum is σ = 2549723510. Its totient is φ = 2549723508.

The previous prime is 2549723507. The next prime is 2549723537. The reversal of 2549723509 is 9053279452.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2383880625 + 165842884 = 48825^2 + 12878^2 .

It is a cyclic number.

It is not a de Polignac number, because 2549723509 - 2¹ = 2549723507 is a prime.

Together with 2549723507, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2549723507) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1274861754 + 1274861755.

It is an arithmetic number, because the mean of its divisors is an integer number (1274861755).

Almost surely, 2^2549723509 is an apocalyptic number.

It is an amenable number.

2549723509 is a deficient number, since it is larger than the sum of its proper divisors (1).

2549723509 is an equidigital number, since it uses as much as digits as its factorization.

2549723509 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 680400, while the sum is 46.

The square root of 2549723509 is about 50494.7869487534. The cubic root of 2549723509 is about 1366.1478283236.

The spelling of 2549723509 in words is "two billion, five hundred forty-nine million, seven hundred twenty-three thousand, five hundred nine".