7440049781 has 2 divisors, whose sum is σ = 7440049782. Its totient is φ = 7440049780.

The previous prime is 7440049753. The next prime is 7440049787. The reversal of 7440049781 is 1879400447.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 4696909156 + 2743140625 = 68534^2 + 52375^2 .

It is a cyclic number.

It is not a de Polignac number, because 7440049781 - 2⁶ = 7440049717 is a prime.

It is a super-2 number, since 2×7440049781² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (7440049787) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3720024890 + 3720024891.

It is an arithmetic number, because the mean of its divisors is an integer number (3720024891).

Almost surely, 2^7440049781 is an apocalyptic number.

It is an amenable number.

7440049781 is a deficient number, since it is larger than the sum of its proper divisors (1).

7440049781 is an equidigital number, since it uses as much as digits as its factorization.

7440049781 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 225792, while the sum is 44.

The square root of 7440049781 is about 86255.7231782332. The cubic root of 7440049781 is about 1952.2043693806.

The spelling of 7440049781 in words is "seven billion, four hundred forty million, forty-nine thousand, seven hundred eighty-one".