7489640281 has 2 divisors, whose sum is σ = 7489640282. Its totient is φ = 7489640280.

The previous prime is 7489640243. The next prime is 7489640287. The reversal of 7489640281 is 1820469847.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 7160544400 + 329095881 = 84620^2 + 18141^2 .

It is a cyclic number.

It is not a de Polignac number, because 7489640281 - 2⁹ = 7489639769 is a prime.

It is a super-2 number, since 2×7489640281² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (7489640287) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3744820140 + 3744820141.

It is an arithmetic number, because the mean of its divisors is an integer number (3744820141).

Almost surely, 2^7489640281 is an apocalyptic number.

It is an amenable number.

7489640281 is a deficient number, since it is larger than the sum of its proper divisors (1).

7489640281 is an equidigital number, since it uses as much as digits as its factorization.

7489640281 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 774144, while the sum is 49.

The square root of 7489640281 is about 86542.7078441621. The cubic root of 7489640281 is about 1956.5321402126.

The spelling of 7489640281 in words is "seven billion, four hundred eighty-nine million, six hundred forty thousand, two hundred eighty-one".